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Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2014	Nov. 01, 2014
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		29,850,692
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,054,930
Entity Registrant Name	RUSH ENTERPRISES INC \TX\
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001012019
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 144,728	$ 217,305
Accounts receivable, net	161,315	103,293
Inventories, net	928,802	802,220
Prepaid expenses and other	8,419	14,341
Deferred income taxes, net	16,929	16,277
Total current assets	1,260,193	1,153,436
Investments	6,812	6,628
Property and equipment, net	874,160	739,663
Goodwill, net	263,071	215,464
Other assets, net	52,376	52,607
Total assets	2,456,612	2,167,798
Current liabilities:
Floor plan notes payable	722,148	593,649
Current maturities of long-term debt	140,751	97,243
Current maturities of capital lease obligations	9,672	10,268
Trade accounts payable	126,275	100,375
Customer deposits	24,836	58,319
Accrued expenses	111,188	69,321
Total current liabilities	1,134,870	929,175
Long-term debt, net of current maturities	411,161	385,538
Capital lease obligations, net of current maturities	34,357	35,199
Other long-term liabilities	4,639	4,683
Deferred income taxes, net	132,807	147,822
Shareholders’ equity:
Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2014 and 2013	0	0
Common stock, par value $.01 per share; 60,000,000 class A shares and 20,000,000 class B shares authorized; 29,850,692 class A shares and 10,075,204 class B shares outstanding in 2014; and 28,910,505 class A shares and 10,304,518 class B shares outstanding in 2013	424	414
Additional paid-in capital	269,467	243,154
Treasury stock, at cost: 2,484,498 class B shares in 2014; and 2,194,519 class B shares in 2013	(39,639)	(30,821)
Retained earnings	509,166	453,836
Accumulated other comprehensive loss, net of tax	(640)	(1,202)
Total shareholders’ equity	738,778	665,381
Total liabilities and shareholders’ equity	$ 2,456,612	$ 2,167,798

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2014	Dec. 31, 2013
Common Class A [Member]
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	29,850,692	28,910,505
Common Class B [Member]
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	10,075,204	10,304,518
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Treasury stock, shares	2,484,498	2,194,519

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
New and used truck sales	$ 846,256	$ 615,616	$ 2,244,447	$ 1,613,420
Parts and service	340,632	257,512	980,588	731,919
Lease and rental	45,114	32,668	130,160	94,166
Finance and insurance	5,227	4,333	14,559	11,304
Other	3,793	2,935	12,396	8,717
Total revenue	1,241,022	913,064	3,382,150	2,459,526
Cost of products sold:
New and used truck sales	787,952	573,657	2,084,945	1,499,384
Parts and service	216,067	161,209	626,786	459,371
Lease and rental	38,264	27,886	112,406	78,983
Total cost of products sold	1,042,283	762,752	2,824,137	2,037,738
Gross profit	198,739	150,312	558,013	421,788
Selling, general and administrative	148,238	114,863	431,943	335,597
Depreciation and amortization	9,488	7,569	27,483	21,938
Gain (loss) on sale of assets	5	(10)	109	19
Operating income	41,018	27,870	98,696	64,272
Interest expense, net	2,689	2,781	8,363	7,774
Income from before taxes	38,329	25,089	90,333	56,498
Provision for income taxes	14,851	9,910	35,003	22,140
Net income	$ 23,478	$ 15,179	$ 55,330	$ 34,358
Earnings per common share:
Basic (in Dollars per share)	$ 0.59	$ 0.38	$ 1.39	$ 0.87
Diluted (in Dollars per share)	$ 0.57	$ 0.37	$ 1.36	$ 0.85
Weighted average shares outstanding:
Basic (in Shares)	40,008	39,558	39,700	39,411
Diluted (in Shares)	41,091	40,623	40,820	40,492
Comprehensive income	$ 23,610	$ 15,280	$ 55,892	$ 34,783

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 55,330	$ 34,358
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	90,335	67,815
Gain on sale of property and equipment	(109)	(19)
Stock-based compensation expense related to stock options and employee stock purchases	9,127	6,975
Provision (benefit) for deferred income tax expense	(16,025)	8,284
Excess tax benefits from stock-based compensation	(5,004)	(2,183)
Acquired research and development	2,000
Change in accounts receivable, net	(50,804)	(22,880)
Change in inventories	(67,019)	(46,446)
Change in prepaid expenses and other, net	6,672	3,117
Change in trade accounts payable	25,901	20,859
Draws on floor plan notes payable – trade, net	26,714	18,298
Change in customer deposits	(33,845)
Change in accrued expenses	45,339	(10,378)
Net cash provided by operating activities	88,612	77,800
Cash flows from investing activities:
Acquisition of property and equipment	(182,164)	(122,999)
Proceeds from the sale of property and equipment	342	453
Business acquisitions	(147,758)	(63,188)
Proceeds from the sale of available for sale securities	150
Change in other assets	1,018	(3,313)
Net cash used in investing activities	(328,412)	(189,047)
Cash flows from financing activities:
Draws on floor plan notes payable – non-trade, net	101,784	35,553
Proceeds from long-term debt	153,369	112,411
Principal payments on long-term debt	(84,076)	(64,911)
Principal payments on capital lease obligations	(10,232)	(10,211)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	11,363	8,092
Excess tax benefits from stock-based compensation	5,004	2,183
Common stock repurchased	(9,989)	(4,383)
Net cash provided by financing activities	167,223	78,734
Net decrease in cash and cash equivalents	(72,577)	(32,513)
Cash and cash equivalents, beginning of period	217,305	198,773
Cash and cash equivalents, end of period	144,728	166,260
Cash paid during the period for:
Interest	21,833	17,592
Income taxes, net of refunds	18,683	6,869
Noncash investing activities:
Common stock issued related to business acquistion	2,000
Assets acquired under capital leases	$ 8,795	$ 5,872

Note 1 - Principles of Consolidation and Basis of Presentation

9 Months Ended

Sep. 30, 2014

Disclosure Text Block [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1 – Principles of Consolidation and Basis of Presentation

The interim consolidated financial statements included herein have been prepared by Rush Enterprises, Inc. and its subsidiaries (collectively referred to as the “Company”), without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). All adjustments have been made to the accompanying interim consolidated financial statements, which, in the opinion of the Company’s management, are necessary for a fair presentation of the Company’s operating results. All adjustments are of a normal recurring nature. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations. It is recommended that these interim consolidated financial statements be read in conjunction with the consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013. Results of operations for interim periods are not necessarily indicative of results that may be expected for any other interim periods or the full fiscal year.

Note 2 - Other Assets

9 Months Ended

Sep. 30, 2014

Disclosure Text Block Supplement [Abstract]

Other Assets Disclosure [Text Block]

2 –Other Assets

The capitalized costs, including capitalized interest, of the SAP enterprise software and SAP dealership management system of $39.1 million are recorded on the Consolidated Balance Sheet in Other Assets at September 30, 2014. These capitalized costs are net of accumulated amortization of $9.5 million. The SAP software is being amortized over a period of 15 years. The Company is currently operating 83 Rush Truck Centers and all of its leasing operations on the SAP enterprise software and SAP dealership management system, which represent approximately 70% of the Company’s total revenue for the nine months ended September 30, 2014. The Company plans to convert all of its existing Rush Truck Centers to the SAP enterprise software and SAP dealership management system by the end of the second quarter of 2015.

Amortization expense relating to the SAP software, which is recognized in depreciation and amortization expense in the Consolidated Statement of Income, was $0.8 million for the three months ended September 30, 2014, and $0.7 million for the three months ended September 30, 2013, and $2.4 million for the nine months ended September 30, 2014, and $2.2 million for the nine months ended September 30, 2013. The Company estimates that amortization expense relating to the SAP software will be approximately $3.3 million for each of the next five succeeding years.

The Company’s only significant identifiable intangible assets, other than goodwill, are rights under franchise agreements with manufacturers. The fair value of the franchise right is determined at the acquisition date by discounting the projected cash flows specific to each acquisition. The carrying value of the Company’s manufacturer franchise rights was $4.5 million at September 30, 2014, and December 31, 2013, and is included in Other Assets on the accompanying consolidated balance sheets. The Company has determined that manufacturer franchise rights have an indefinite life as there are no economic or other factors that limit their useful lives and they are expected to generate cash flows indefinitely due to the historically long lives of the manufacturers’ brand names. Furthermore, to the extent that any agreements evidencing manufacturer franchise rights have expiration dates, the Company expects that it will be able to renew those agreements in the ordinary course of business. Accordingly, the Company does not amortize manufacturer franchise rights.

Due to the fact that manufacturer franchise rights are specific to geographic region, the Company has determined that the geographic region is the appropriate level for purposes of testing franchise rights for impairment. Management reviews indefinite-lived manufacturer franchise rights for impairment annually during the fourth quarter, or more often if events or circumstances indicate that an impairment may have occurred. The Company is subject to financial statement risk to the extent that manufacturer franchise rights become impaired due to decreases in the fair market value of its individual franchises.

The significant estimates and assumptions used by management in assessing the recoverability of manufacturer franchise rights include estimated future cash flows, present value discount rate, and other factors. Any changes in these estimates or assumptions could result in an impairment charge. The estimates of future cash flows, based on reasonable and supportable assumptions and projections, require management’s subjective judgment. Depending on the assumptions and estimates used, the estimated future cash flows projected in the evaluations of manufacturer franchise rights can vary within a range of outcomes.

No impairment write down was required in the fourth quarter of 2013. The Company cannot predict the occurrence of certain events that might adversely affect the reported value of manufacturer franchise rights in the future. However, no facts or circumstances were noted during the nine months ended September 30, 2014 that would indicate impairment.

Note 3 - Commitments and Contingencies

9 Months Ended

Sep. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

3 – Commitments and Contingencies

From time to time, the Company is involved in litigation arising out of its operations in the ordinary course of business. The Company maintains liability insurance, including product liability coverage, in amounts deemed adequate by management. To date, aggregate costs to us for claims, including product liability actions, have not been material. However, an uninsured or partially insured claim, or claim for which indemnification is not available, could have a material adverse effect on the Company’s financial condition or results of operations. The Company believes that there are no claims or litigation pending, the outcome of which could have a material adverse effect on its financial position or results of operations. However, due to the inherent uncertainty of litigation, there can be no assurance that the resolution of any particular claim or proceeding would not have a material adverse effect on the Company’s financial condition or results of operations for the fiscal period in which such resolution occurred.

In May 2013, the Company entered into a Retirement and Transition Agreement with the Company’s former Chairman, W. Marvin Rush, which resulted in the recognition of $10.8 million in retirement pay and benefits recorded in selling, general and administrative expense on the Consolidated Statements of Income and Comprehensive Income for the nine months ended September 30, 2013.

Note 4 - Earnings Per Share

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

4 – Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share information):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	23,478	$	15,179	$	55,330	$	34,358

Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		40,008		39,558		39,700		39,411
Effect of dilutive securities–
Employee and director stock options and restricted share awards		1,083		1,065		1,120		1,081
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		41,091		40,623		40,820		40,492

Basic earnings per common share	$	.59	$	.38	$	1.36	$	.87
Diluted earnings per common share and common share equivalents	$	.57	$	.37	$	1.39	$	.85

Options to purchase shares of common stock that were outstanding for the three months and nine months ended September 30, 2014 and 2013 that were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive are as follows (in thousands):

Three Months Ended

September 30,

Nine months Ended

September 30,

2014

2013

2014

2013

Anti-dilutive options

395

865

516

865

Note 5 - Stock Options and Restricted Stock Awards

9 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

5 – Stock Options and Restricted Stock Awards

Valuation and Expense Information

The Company accounts for stock-based compensation in accordance with Accounting Standards Codification (“ASC”) 718-10, “Compensation – Stock Compensation,” which requires the measurement and recognition of compensation expense for all share-based payment awards made to the Company’s employees and directors, including employee stock options, restricted share awards, restricted stock unit awards and employee stock purchases related to the Employee Stock Purchase Plan based on estimated fair values. Stock-based compensation expense, calculated using the Black-Scholes option-pricing model and included in selling, general and administrative expense, was $2.0 million for the three months ended September 30, 2014, and $1.5 million for the three months ended September 30, 2013. Stock-based compensation expense, included in selling, general and administrative expense, for the nine months ended September 30, 2014, was $9.1 million and for the nine months ended September 30, 2013, was $7.0 million. As of September 30, 2014, there was $17.9 million of total unrecognized compensation expense related to non-vested, share-based compensation arrangements to be recognized over a weighted-average period of 2.8 years.

Note 6 - Financial Instruments and Fair Value

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

6 – Financial Instruments and Fair Value

The Company measures certain financial assets and liabilities at fair value on a recurring basis. Financial instruments consist primarily of cash, accounts receivable, accounts payable and floor plan notes payable. The carrying values of the Company’s financial instruments approximate fair value due either to their short-term nature or the existence of variable interest rates, which approximate market rates. Certain methods and assumptions were used by the Company in estimating the fair value of financial instruments at September 30, 2014 and 2013. The carrying value of current assets and current liabilities approximates the fair value due to the short maturity of these items.

The fair value of the Company’s long-term debt is based on secondary market indicators. Because the Company’s debt is not quoted, estimates are based on each obligation’s characteristics, including remaining maturities, interest rate, credit rating, collateral and liquidity. Accordingly, the Company concluded that the valuation measurement inputs of its long-term debt represent, at its lowest level, current market interest rates available to the Company for similar debt and the Company’s current credit standing, and has categorized such debt within Level 2 of the hierarchy framework. The carrying amount approximates fair value.

If investments are deemed to be impaired, the Company determines whether the impairment is temporary or other than temporary. If the impairment is deemed to be temporary, the Company records an unrealized loss in other comprehensive income. If the impairment is deemed other than temporary, the Company records the impairment in the Company’s consolidated statement of income.

In prior years, the Company invested in interest-bearing, short-term investments, primarily consisting of investment-grade auction rate securities classified as available-for-sale and reported at fair value. These types of investments were designed to provide liquidity through an auction process that reset the applicable interest rates at predetermined periods ranging from 1 to 35 days. This reset mechanism was intended to allow existing investors to continue to own their respective interest in the auction rate security or to gain immediate liquidity by selling their interests at par.

Auctions for investment grade securities held by the Company have failed. However, a failed auction does not represent a default by the issuer. The auction rate securities continue to pay interest in accordance with the terms of the underlying security; however, liquidity will be limited until there is a successful auction or until such time as other markets for these investments develop. The Company has the intent and ability to hold these auction rate securities until liquidity returns to the market. The Company does not believe that the lack of liquidity relating to its auction rate securities will have a material impact on its ability to fund operations.

As of September 30, 2014, the Company held auction rate securities with underlying tax-exempt municipal bonds that mature in 2030 and have a fair value of $6.8 million and a cost basis of $7.4 million. The Company sold $150,000 of the auction rate securities during the second quarter of 2014. These bonds have credit wrap insurance and a credit rating of A by a major credit rating agency.

The Company valued the auction rate securities at September 30, 2014, using a discounted cash flow model based on the characteristics of the individual securities, which the Company believes yields the best estimate of fair value. The first step in the valuation included a credit analysis of the security which considered various factors including the credit quality of the issuer, the instrument’s position within the capital structure of the issuing authority, and the composition of the authority’s assets including the effect of insurance and/or government guarantees. Next, the future cash flows of the instruments were projected based on certain assumptions regarding the auction rate market significant to the valuation including the auction rate market will remain illiquid and auctions will continue to fail causing the interest rate to be the maximum applicable rate. This assumption resulted in discounted cash flow analysis being performed through 2019, the point at which the Company estimates the securities will be redeemed by the municipality. The projected cash flows were then discounted using the applicable yield curve plus a 225 basis point liquidity premium added to the applicable discount rate.

The Company recorded a pre-tax impairment charge of $1.0 million on these auction rate securities in 2011 and a subsequent pre-tax increase in fair value of $184,000 in the second quarter of 2014. The Company believes that the impairment is temporary and has included the impairment in accumulated other comprehensive loss.

The table below presents disclosures about the auction rate securities measured at fair value on a recurring basis in the Company’s financial statements as follows (in thousands):

At September 30, 2014

At December 31, 2013

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Level 1
Inputs

Level 2

Inputs

Level 3

Inputs

Investment in auction rate securities

—

6,812

—

6,628

	Cost Basis Amount		Gross Unrealized (Gain) Loss In Accumulated OCI		Fair Value
September 30, 2014
Investment in auction rate securities	$	7,425	$	613	$	6,812

December 31, 2013
Investment in auction rate securities	$	7,575	$	947	$	6,628

Interest Rate Swap Agreements

The Company has entered into swap agreements to hedge against the potential impact of increases in interest rates on its floating-rate debt instruments. Swap agreements that hedge exposures to changes in interest rates expose us to credit risk and market risk. Credit risk is the potential failure of the counterparty to perform under the terms of the swap agreement. The Company attempts to minimize this risk by entering into transactions with high-quality counterparties. Market risk is the potential adverse effect on the value of the swap agreement that results from a decline in interest rates. The market risk associated with interest-rate contracts is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken.

At September 30, 2014, the Company had an aggregate $35.8 million notional amount of interest rate swap contracts, which have been designated as cash flow hedges, to pay fixed rates of interest and receive a floating interest rate based on LIBOR. The fixed interest rates specified in the interest rate swap contracts became effective on or about January 1, 2012. The Company’s interest rate swaps qualify for cash flow hedge accounting treatment. Unrealized gains or losses are recorded in accumulated other comprehensive income. Realized gains and losses will be recognized in interest expense, if they occur. Amounts to be received or paid under the contracts will be recognized as interest expense over the life of the contracts. There was no ineffectiveness for these swaps during the three months ended September 30, 2014 and 2013.

The fair value of cash flow hedges is calculated as the present value of expected future cash flows, determined on the basis of forward interest rates and present value factors. As such, the carrying amounts for these swaps are designated to be Level 2 fair values and totaled a liability of $0.4 million as of September 30, 2014. The carrying value of these swaps is included in Other Long-Term Liabilities on the accompanying Consolidated Balance Sheet as of September 30, 2014.

As of September 30, 2014, the Company was a party to derivative financial instruments, as described in the following table (in thousands):

Agreement	Notional Amount		Fixed Interest Rate			Underlying Rate	Expiration Date	Fair Value
Interest Rate Swap	$	1,749		5.075	%	3 month LIBOR	July 1, 2015	$	(26	)
Interest Rate Swap		3,612		5.075	%	3 month LIBOR	July 1, 2015		(54	)
Interest Rate Swap		6,237		5.39	%	1 month LIBOR	December 31, 2014		(34	)
Interest Rate Swap		1,206		5.39	%	1 month LIBOR	December 31, 2014		(6	)
Interest Rate Swap		2,146		5.39	%	1 month LIBOR	December 31, 2014		(12	)
Interest Rate Swap		4,856		5.39	%	1 month LIBOR	December 31, 2014		(26	)
Interest Rate Swap		4,472		5.38	%	1 month LIBOR	June 29, 2015		(80	)
Interest Rate Swap		688		5.29	%	1 month LIBOR	June 30, 2015		(12	)
Interest Rate Swap		1,319		5.29	%	1 month LIBOR	June 30, 2015		(23	)
Interest Rate Swap		6,650		5.29	%	1 month LIBOR	June 30, 2015		(114	)
Interest Rate Swap		573		5.29	%	1 month LIBOR	June 30, 2015		(10	)
Interest Rate Swap		2,305		5.29	%	1 month LIBOR	June 30, 2015		(40	)

Fair values of derivative instruments are on the accompanying Consolidated Balance Sheet (in thousands):

		Fair Value at
Derivative Liabilities Designated as Hedging Instruments	Balance Sheet Location	September 30, 2014		December 31, 2013
Interest Rate Swaps	Other Long-Term Liabilities	$	437	$	1,024

(in thousands)	Gain Recognized in OCI on Derivatives (Effective Portion) during the Three Months Ended				Location of Loss	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Three Months Ended
	September 30, 2014		September 30, 2013		Reclassified into Income	September 30, 2014			September 30, 2013
Interest rate swaps	$	216	$	165	Interest Expense	$	(55	)	$	(60	)

(in thousands)	Gain Recognized in OCI on Derivatives (Effective Portion) during the Nine Months Ended				Location of Loss	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Nine Months Ended
	September 30, 2014		September 30, 2013		Reclassified into Income	September 30, 2014			September 30, 2013
Interest rate swaps	$	587	$	691	Interest Expense	$	(166	)	$	(231	)

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 7 - Segment Information

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

7 – Segment Information

The Company currently has one reportable business segment, the Truck Segment. The Truck Segment includes the Company’s operation of a network of commercial vehicle dealerships that provide an integrated one-stop source for the commercial vehicle needs of its customers, including retail sales of new and used commercial vehicles; aftermarket parts, service and body shop facilities; and a wide array of financial services, including the financing of new and used commercial vehicle purchases, insurance products and truck leasing and rentals. The commercial vehicle dealerships are deemed a single reporting unit because they have similar economic characteristics. The Company’s chief operating decision maker considers the entire Truck Segment, not individual dealerships, when making decisions about resources to be allocated to the segment and assess its performance.

The Company also has revenues attributable to three other operating segments. These segments include a retail tire company, an insurance agency and a guest ranch operation and are included in the All Other column below. None of these segments has ever met any of the quantitative thresholds for determining reportable segments.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The Company evaluates performance based on income before income taxes, not including extraordinary items.

The following table contains summarized information about reportable segment revenue, segment income or loss and segment assets for the periods ended September 30, 2014 and 2013 (in thousands):

	Truck Segment		All Other			Totals

As of and for the three months ended September 30, 2014

Revenues from external customers	$	1,236,101	$	4,921		$	1,241,022
Segment income (loss) before taxes		38,366		(37	)		38,329
Segment assets		2,426,368		30,244			2,456,612

For the nine months ended September 30, 2014

Revenues from external customers	$	3,368,037	$	14,113		$	3,382,150
Segment income (loss) before taxes		90,459		(126	)		90,333

As of and for the three months ended September 30, 2013

Revenues from external customers	$	907,903	$	5,161		$	913,064
Segment income (loss) before taxes		25,149		(60	)		25,089
Segment assets		2,016,725		28,806			2,045,530

For the nine months ended September 30, 2013

Revenues from external customers	$	2,445,151	$	14,375		$	2,459,526
Segment income (loss) before taxes		56,685		(187	)		56,498

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Note 8 - Income Taxes

9 Months Ended

Sep. 30, 2014

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

8 – Income Taxes

The Company included accruals for unrecognized income tax benefits totaling $1.5 million as a component of accrued liabilities as of September 30, 2014, and $1.4 million as of September 30, 2013. The unrecognized tax benefits, if recognized, would impact the Company’s effective tax rate. An unfavorable settlement would require a charge to income tax expense and a favorable resolution would be recognized as a reduction to income tax expense. The Company records interest and penalties related to unrecognized income tax benefits in income tax expense. The Company had accrued interest of $81,000 at September 30, 2014, and December 31, 2013, related to unrecognized tax benefits. No amounts were accrued for penalties.

The Company does not anticipate a significant change in the amount of unrecognized tax benefits in the next 12 months. As of September 30, 2014, the tax years ended December 31, 2010 through 2013, remained subject to audit by federal tax authorities and the tax years ended December 31, 2009 through 2013, remained subject to audit by state tax authorities.

Note 9 - Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2014

Disclosure Text Block [Abstract]

Comprehensive Income (Loss) Note [Text Block]

9 – Accumulated Other Comprehensive Income

The following table shows the components of accumulated other comprehensive loss, net of tax, (in thousands):

	Three Months Ended September 30, 2014
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at June 30, 2014	$	(398	)	$	(374	)	$	(772	)
Change in fair value		216			−			216
Income tax deferred		(84	)		−			(84	)
Balance at September 30, 2014	$	(266	)	$	(374	)	$	(640	)

	Three Months Ended September 30, 2013
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at June 30, 2013	$	(854	)	$	(578	)	$	(1,432	)
Change in fair value		165			−			165
Income tax deferred		(64	)		−			(64	)
Balance at September 30, 2013	$	(753	)	$	(578	)	$	(1,331	)

	Nine Months Ended September 30, 2014
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at December 31, 2013	$	(624	)	$	(578	)	$	(1,202	)
Change in fair value		587			184			771
Sale of available for sale securities		−			150			150
Income tax deferred		(229	)		(130	)		(359	)
Balance at September 30, 2014	$	(266	)	$	(374	)	$	(640	)

	Nine Months Ended September 30, 2013
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at December 31, 2012	$	(1,178	)	$	(578	)	$	(1,756	)
Change in fair value		691			−			691
Income tax deferred		(266	)		−			(266	)
Balance at September 30, 2013	$	(753	)	$	(578	)	$	(1,331	)

The following table shows the amount of loss reclassified from accumulated other comprehensive loss into earnings (in thousands):

	Three Months Ended						Nine Months Ended
	September 30, 2014			September 30, 2013			September 30, 2014			September 30, 2013
Losses on cash flow swaps to:
Interest expense	$	(55	)	$	(60	)	$	(166	)	$	(231	)
Income tax benefit		21			23			65			89
Total reclassifications	$	(34	)	$	(37	)	$	(101	)	$	(142	)

The following table shows the reconciliation of net income to comprehensive income (in thousands):

	Three Months Ended				Nine Months Ended
	September 30, 2014		September 30, 2013		September 30, 2014		September 30, 2013

Net Income	$	23,478	$	15,179	$	55,330	$	34,358
Other comprehensive income, before tax:
Change in fair value of interest rate swaps		216		165		587		691
Change in fair value of available-for-sale securities		−		−		184		−
Unrealized gain on available-for-sale securities		−		−		150		−
Other comprehensive income, before tax		216		165		921		691
Income tax expense related to components of other comprehensive income		84		64		359		266
Other comprehensive income, net of tax		132		101		562		425
Comprehensive income	$	23,610	$	15,280	$	55,892	$	34,783

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Note 10 - Acquisitions

9 Months Ended

Sep. 30, 2014

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

10 – Acquisitions

On July 1, 2014, the Company acquired certain assets of Truck Parts Depot, Inc. which included a commercial parts and service facility in Gainsville, Georgia. The Gainsville location is operating as a full-service Rush Truck Center and offers commercial vehicles manufactured by International. The transaction was valued at approximately $0.5 million, with the purchase price paid in cash.

On June 25, 2014, a joint venture was established to further expand the Company’s used commercial vehicle sales network. As a result, the Company owns 50% of Central California Truck and Trailer Sales, LLC (“CCTTS”), which has locations in Fresno and Stockton, California that sell used trucks. In connection with the formation of this joint venture, the Company contributed $2.2 million. CCTTS is accounted for using the equity method of accounting in accordance with ASC 323, “Investments-Equity Method and Joint Venture,” and is recorded on the Consolidated Balance Sheet in Other Assets.

In May 2014, the Company announced an agreement with 3M to pursue the design, manufacture and installation of a portfolio of compressed natural gas (“CNG”) fuel systems for use in Class 6 through 8 vehicles. The Agreement allows the Company to engineer, assemble and install CNG fuel systems utilizing 3M’s CNG tanks, as well as provide market distribution and aftermarket support. In addition to the initial $2.0 million investment for research and development, which was recorded in selling, general and administrative expense, the Company will continue to incur expenses to bring its CNG fuel system to market. The transaction did not qualify as a business combination in accordance with ASC 805, “Business Combinations.”

On January 13, 2014, the Company acquired certain assets of CIT, Inc., which did business as Chicago International Trucks, Mcgrenho L.L.C., which did business as Indy Truck Sales, and Indiana Mack Leasing, LLC; and the membership interests of Idealease of Chicago, LLC. The acquisition included International commercial truck dealerships and Idealease commercial vehicle rental and leasing businesses in Carol Stream, Chicago, Grayslake, Huntley, Joliet, Kankakee and Ottawa, Illinois, and Brazil, Gary and Indianapolis, Indiana.

The purchase price for the assets, membership interests, goodwill and dealership properties was approximately $145.1 million, which was paid in cash and 83,091 shares of the Company’s Class B Common Stock with a total value of $2.0 million on the date of acquisition. The operations of CIT, Inc. are included in the accompanying consolidated financial statements from the date of the acquisition. The preliminary purchase price was allocated based on the fair values of the assets at the date of acquisition as follows (in thousands):

Property and equipment	$	60,066
Goodwill		47,326
Inventory		31,048
Accounts receivable		7,175
Prepaid expenses		750
Other		23
Accrued expenses		(1,325	)

Total	$	145,063

As the value of certain assets and liabilities are preliminary in nature, they are subject to adjustment as additional information is obtained about the facts and circumstances that existed at the acquisition date. Pro forma information is not included in accordance with ASC 805, “Business Combinations,” because the acquisition was not considered material.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Note 4 - Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	23,478	$	15,179	$	55,330	$	34,358

Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		40,008		39,558		39,700		39,411
Effect of dilutive securities–
Employee and director stock options and restricted share awards		1,083		1,065		1,120		1,081
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		41,091		40,623		40,820		40,492

Basic earnings per common share	$	.59	$	.38	$	1.36	$	.87
Diluted earnings per common share and common share equivalents	$	.57	$	.37	$	1.39	$	.85

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

Three Months Ended

September 30,

Nine months Ended

September 30,

2014

2013

2014

2013

Anti-dilutive options

395

865

516

865

Note 6 - Financial Instruments and Fair Value (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

At September 30, 2014

At December 31, 2013

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Level 1
Inputs

Level 2

Inputs

Level 3

Inputs

Investment in auction rate securities

—

6,812

—

6,628

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	Cost Basis Amount		Gross Unrealized (Gain) Loss In Accumulated OCI		Fair Value
September 30, 2014
Investment in auction rate securities	$	7,425	$	613	$	6,812

December 31, 2013
Investment in auction rate securities	$	7,575	$	947	$	6,628

Schedule of Derivative Instruments [Table Text Block]

Agreement	Notional Amount		Fixed Interest Rate			Underlying Rate	Expiration Date	Fair Value
Interest Rate Swap	$	1,749		5.075	%	3 month LIBOR	July 1, 2015	$	(26	)
Interest Rate Swap		3,612		5.075	%	3 month LIBOR	July 1, 2015		(54	)
Interest Rate Swap		6,237		5.39	%	1 month LIBOR	December 31, 2014		(34	)
Interest Rate Swap		1,206		5.39	%	1 month LIBOR	December 31, 2014		(6	)
Interest Rate Swap		2,146		5.39	%	1 month LIBOR	December 31, 2014		(12	)
Interest Rate Swap		4,856		5.39	%	1 month LIBOR	December 31, 2014		(26	)
Interest Rate Swap		4,472		5.38	%	1 month LIBOR	June 29, 2015		(80	)
Interest Rate Swap		688		5.29	%	1 month LIBOR	June 30, 2015		(12	)
Interest Rate Swap		1,319		5.29	%	1 month LIBOR	June 30, 2015		(23	)
Interest Rate Swap		6,650		5.29	%	1 month LIBOR	June 30, 2015		(114	)
Interest Rate Swap		573		5.29	%	1 month LIBOR	June 30, 2015		(10	)
Interest Rate Swap		2,305		5.29	%	1 month LIBOR	June 30, 2015		(40	)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

		Fair Value at
Derivative Liabilities Designated as Hedging Instruments	Balance Sheet Location	September 30, 2014		December 31, 2013
Interest Rate Swaps	Other Long-Term Liabilities	$	437	$	1,024

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

(in thousands)	Gain Recognized in OCI on Derivatives (Effective Portion) during the Three Months Ended				Location of Loss	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Three Months Ended
	September 30, 2014		September 30, 2013		Reclassified into Income	September 30, 2014			September 30, 2013
Interest rate swaps	$	216	$	165	Interest Expense	$	(55	)	$	(60	)

(in thousands)	Gain Recognized in OCI on Derivatives (Effective Portion) during the Nine Months Ended				Location of Loss	Loss Reclassified from Accumulated OCI into Income (Effective Portion) during the Nine Months Ended
	September 30, 2014		September 30, 2013		Reclassified into Income	September 30, 2014			September 30, 2013
Interest rate swaps	$	587	$	691	Interest Expense	$	(166	)	$	(231	)

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Note 7 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Truck Segment		All Other			Totals

As of and for the three months ended September 30, 2014

Revenues from external customers	$	1,236,101	$	4,921		$	1,241,022
Segment income (loss) before taxes		38,366		(37	)		38,329
Segment assets		2,426,368		30,244			2,456,612

For the nine months ended September 30, 2014

Revenues from external customers	$	3,368,037	$	14,113		$	3,382,150
Segment income (loss) before taxes		90,459		(126	)		90,333

As of and for the three months ended September 30, 2013

Revenues from external customers	$	907,903	$	5,161		$	913,064
Segment income (loss) before taxes		25,149		(60	)		25,089
Segment assets		2,016,725		28,806			2,045,530

For the nine months ended September 30, 2013

Revenues from external customers	$	2,445,151	$	14,375		$	2,459,526
Segment income (loss) before taxes		56,685		(187	)		56,498

Note 9 - Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2014

Reclassifications [Member]

Note 9 - Accumulated Other Comprehensive Income (Tables) [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Three Months Ended						Nine Months Ended
	September 30, 2014			September 30, 2013			September 30, 2014			September 30, 2013
Losses on cash flow swaps to:
Interest expense	$	(55	)	$	(60	)	$	(166	)	$	(231	)
Income tax benefit		21			23			65			89
Total reclassifications	$	(34	)	$	(37	)	$	(101	)	$	(142	)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Three Months Ended September 30, 2014
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at June 30, 2014	$	(398	)	$	(374	)	$	(772	)
Change in fair value		216			−			216
Income tax deferred		(84	)		−			(84	)
Balance at September 30, 2014	$	(266	)	$	(374	)	$	(640	)

	Three Months Ended September 30, 2013
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at June 30, 2013	$	(854	)	$	(578	)	$	(1,432	)
Change in fair value		165			−			165
Income tax deferred		(64	)		−			(64	)
Balance at September 30, 2013	$	(753	)	$	(578	)	$	(1,331	)

	Nine Months Ended September 30, 2014
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at December 31, 2013	$	(624	)	$	(578	)	$	(1,202	)
Change in fair value		587			184			771
Sale of available for sale securities		−			150			150
Income tax deferred		(229	)		(130	)		(359	)
Balance at September 30, 2014	$	(266	)	$	(374	)	$	(640	)

	Nine Months Ended September 30, 2013
	Cash Flow Swaps			Available for Sale Securities			Total
Balance at December 31, 2012	$	(1,178	)	$	(578	)	$	(1,756	)
Change in fair value		691			−			691
Income tax deferred		(266	)		−			(266	)
Balance at September 30, 2013	$	(753	)	$	(578	)	$	(1,331	)

Comprehensive Income (Loss) [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30, 2014		September 30, 2013		September 30, 2014		September 30, 2013

Net Income	$	23,478	$	15,179	$	55,330	$	34,358
Other comprehensive income, before tax:
Change in fair value of interest rate swaps		216		165		587		691
Change in fair value of available-for-sale securities		−		−		184		−
Unrealized gain on available-for-sale securities		−		−		150		−
Other comprehensive income, before tax		216		165		921		691
Income tax expense related to components of other comprehensive income		84		64		359		266
Other comprehensive income, net of tax		132		101		562		425
Comprehensive income	$	23,610	$	15,280	$	55,892	$	34,783

Note 10 - Acquisitions (Tables)

9 Months Ended

Sep. 30, 2014

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

Property and equipment	$	60,066
Goodwill		47,326
Inventory		31,048
Accounts receivable		7,175
Prepaid expenses		750
Other		23
Accrued expenses		(1,325	)

Total	$	145,063

Note 2 - Other Assets (Details) $ in Millions	3 Months Ended			9 Months Ended
Note 2 - Other Assets (Details) $ in Millions	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
SAP Enterprise Software And SAP Dealership Management System [Member] \| Sales Revenue, Net [Member]
Note 2 - Other Assets (Details) [Line Items]
Concentration Risk, Percentage				70.00%
Rush Truck Centers [Member]
Note 2 - Other Assets (Details) [Line Items]
Number of Stores	83			83
Computer Software, Intangible Asset [Member]
Note 2 - Other Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life				15 years
Amortization of Intangible Assets	$ 0.8		$ 0.7	$ 2.4	$ 2.2
Capitalized Computer Software, Net	39.1			39.1
Capitalized Computer Software, Accumulated Amortization	9.5			9.5
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			3.3		3.3
Finite-Lived Intangible Assets, Amortization Expense, Year Two			3.3		3.3
Finite-Lived Intangible Assets, Amortization Expense, Year Three			3.3		3.3
Finite-Lived Intangible Assets, Amortization Expense, Year Five			$ 3.3		$ 3.3
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3.3			3.3
Indefinite-Lived Franchise Rights	$ 4.5	$ 4.5		$ 4.5
Goodwill and Intangible Asset Impairment		$ 0.0

Note 3 - Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Retirement Pay and Benefits [Member]
Note 3 - Commitments and Contingencies (Details) [Line Items]
Selling, General and Administrative Expense				$ 10,800
Selling, General and Administrative Expense	$ 148,238	$ 114,863	$ 431,943	$ 335,597

Note 4 - Earnings Per Share (Details) - Earnings Per Share Calculation - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders (in Dollars)	$ 23,478	$ 15,179	$ 55,330	$ 34,358
Denominator–
Denominator for basic earnings per share – weighted average shares outstanding	40,008	39,558	39,700	39,411
Effect of dilutive securities–
Employee and director stock options and restricted share awards	1,083	1,065	1,120	1,081
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions	41,091	40,623	40,820	40,492
Basic earnings per common share (in Dollars per share)	$ 0.59	$ 0.38	$ 1.36	$ 0.87
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 0.57	$ 0.37	$ 1.39	$ 0.85

Note 4 - Earnings Per Share (Details) - Anti-Dilutive Securities - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Anti-Dilutive Securities [Abstract]
Anti-dilutive options	395	865	516	865

Note 5 - Stock Options and Restricted Stock Awards (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Selling, General and Administrative Expenses [Member]
Note 5 - Stock Options and Restricted Stock Awards (Details) [Line Items]
Allocated Share-based Compensation Expense	$ 2.0	$ 1.5	$ 9.1	$ 7.0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 17.9		$ 17.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 292 days

Note 6 - Financial Instruments and Fair Value (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2011	Sep. 30, 2014	Dec. 31, 2013
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Note 6 - Financial Instruments and Fair Value (Details) [Line Items]
Derivative Asset, Notional Amount	$ 35,800,000
Auction Rate Securities [Member]
Note 6 - Financial Instruments and Fair Value (Details) [Line Items]
Available-for-sale Securities			$ 6,812,000	$ 6,628,000
Available-for-sale Securities, Amortized Cost Basis			$ 7,425,000	$ 7,575,000
Available-for-sale Securities, Sold at Par	150,000
Derivative, Basis Spread on Variable Rate			2.25%
Asset Impairment Charges		$ 1,000,000
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	184,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 400,000

Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities - Fair Value - Auction Rate Securities [Member] - USD ($) $ in Thousands	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities - Fair Value [Line Items]
Investment in auction rate securities		$ 6,812	$ 6,628
Investment in auction rate securities	$ 6,812		$ 6,628

Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities - Auction Rate Securities [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities [Line Items]
Cost Basis Amount	$ 7,425	$ 7,575
Gross Unrealized (Gain) Loss In Accumulated OCI	613	947
Fair Value	$ 6,812	$ 6,628

Note 6 - Financial Instruments and Fair Value (Details) - Derivative Financial Instruments $ in Thousands	9 Months Ended
	Sep. 30, 2014 USD ($)
Interest Rate Swap Agreement 1 [Member]
Derivative [Line Items]
Current Notional Amount	$ 1,749
Fixed Interest Rate	5.075%
Expiration Date	Jul. 01, 2015
Fair Value	$ (26)
Interest Rate Swap Agreement 2 [Member]
Derivative [Line Items]
Current Notional Amount	$ 3,612
Fixed Interest Rate	5.075%
Expiration Date	Jul. 01, 2015
Fair Value	$ (54)
Interest Rate Swap Agreement 3 [Member]
Derivative [Line Items]
Current Notional Amount	$ 6,237
Fixed Interest Rate	5.39%
Expiration Date	Dec. 31, 2014
Fair Value	$ (34)
Interest Rate Swap Agreement 4 [Member]
Derivative [Line Items]
Current Notional Amount	$ 1,206
Fixed Interest Rate	5.39%
Expiration Date	Dec. 31, 2014
Fair Value	$ (6)
Interest Rate Swap Agreement 5 [Member]
Derivative [Line Items]
Current Notional Amount	$ 2,146
Fixed Interest Rate	5.39%
Expiration Date	Dec. 31, 2014
Fair Value	$ (12)
Interest Rate Swap Agreement 6 [Member]
Derivative [Line Items]
Current Notional Amount	$ 4,856
Fixed Interest Rate	5.39%
Expiration Date	Dec. 31, 2014
Fair Value	$ (26)
Interest Rate Swap Agreement 7 [Member]
Derivative [Line Items]
Current Notional Amount	$ 4,472
Fixed Interest Rate	5.38%
Expiration Date	Jun. 29, 2015
Fair Value	$ (80)
Interest Rate Swap Agreement 8 [Member]
Derivative [Line Items]
Current Notional Amount	$ 688
Fixed Interest Rate	5.29%
Expiration Date	Jun. 30, 2015
Fair Value	$ (12)
Interest Rate Swap Agreement 9 [Member]
Derivative [Line Items]
Current Notional Amount	$ 1,319
Fixed Interest Rate	5.29%
Expiration Date	Jun. 30, 2015
Fair Value	$ (23)
Interest Rate Swap Agreement 10 [Member]
Derivative [Line Items]
Current Notional Amount	$ 6,650
Fixed Interest Rate	5.29%
Expiration Date	Jun. 30, 2015
Fair Value	$ (114)
Interest Rate Swap Agreement 11 [Member]
Derivative [Line Items]
Current Notional Amount	$ 573
Fixed Interest Rate	5.29%
Expiration Date	Jun. 30, 2015
Fair Value	$ (10)
Interest Rate Swap Agreement 12 [Member]
Derivative [Line Items]
Current Notional Amount	$ 2,305
Fixed Interest Rate	5.29%
Expiration Date	Jun. 30, 2015
Fair Value	$ (40)

Note 6 - Financial Instruments and Fair Value (Details) - Fair Values of Derivative Instruments - USD ($) $ in Thousands	Sep. 30, 2014	Dec. 31, 2013
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Swaps	$ 437	$ 1,024

Note 6 - Financial Instruments and Fair Value (Details) - Pre-tax Effect of Interest Rate Swaps - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pre-tax Effect of Interest Rate Swaps [Abstract]
Interest rate swaps	$ 216	$ 165	$ 587	$ 691
Interest rate swaps	$ (55)	$ (60)	$ (166)	$ (231)

Note 7 - Segment Information (Details)	9 Months Ended
Note 7 - Segment Information (Details)	Sep. 30, 2014
Segment Reporting [Abstract]
Number of Reportable Segments	1
Number of Operating Segments	3

Note 7 - Segment Information (Details) - Segment Reporting Information - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Truck Segment [Member]
Segment Reporting Information [Line Items]
Revenues from external customers, by segment	$ 1,236,101	$ 907,903	$ 3,368,037	$ 2,445,151
Segment income (loss) from continuing operations before taxes, by segment	38,366	25,149	90,459	56,685
As of and for the three months ended September 30, 2013
Segment assets, by segment	2,426,368	2,016,725	2,426,368	2,016,725
Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers, by segment	4,921	5,161	14,113	14,375
Segment income (loss) from continuing operations before taxes, by segment	(37)	(60)	(126)	(187)
As of and for the three months ended September 30, 2013
Segment assets, by segment	30,244	28,806	30,244	28,806
Revenues from external customers, by segment	1,241,022	913,064	3,382,150	2,459,526
Segment income (loss) from continuing operations before taxes, by segment	38,329	25,089	90,333	56,498
Segment assets, by segment	$ 2,456,612	$ 2,045,530	$ 2,456,612	$ 2,045,530	$ 2,167,798

Note 8 - Income Taxes (Details) - USD ($)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 1,500,000		$ 1,400,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	81,000	$ 81,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 0	$ 0

Note 9 - Accumulated Other Comprehensive Income (Details) - Accmulated Other Comprehensive (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accmulated Other Comprehensive (Loss) [Abstract]
Balance, Cash Flow Swaps	$ (398)	$ (854)	$ (624)	$ (1,178)
Balance, Available for Sale Securities	(374)	(578)	(578)	(578)
Balance, Total	(772)	(1,432)	(1,202)	(1,756)
Balance, Cash Flow Swaps	(266)	(753)	(266)	(753)
Balance, Available for Sale Securities	(374)	(578)	(374)	(578)
Balance, Total	(640)	(1,331)	(640)	(1,331)
Changes in value, Cash Flow Swaps	216	165	587	691
Changes in value, Available for Sale Securities			184
Changes in value, Total	216	165	771	691
Sale of available for sale securities			150
Sale of available for sale securities			150
Income tax deferred, Cash Flows Swaps	(84)	(64)	(229)	(266)
Income tax deferred, Total	$ (84)	$ (64)	(359)	$ (266)
Income tax deferred, Available for Sale Securities			$ (130)

Note 9 - Accumulated Other Comprehensive Income (Details) - Loss Reclassified From Accumulated Other Comprehensive (Loss) Into Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Losses on cash flow swaps to:
Interest expense	$ (55)	$ (60)	$ (166)	$ (231)
Income tax benefit	21	23	65	89
Total reclassifications	$ (34)	$ (37)	$ (101)	$ (142)

Note 9 - Accumulated Other Comprehensive Income (Details) - Reconciliation of Net Income to Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of Net Income to Comprehensive Income [Abstract]
Net Income	$ 23,478	$ 15,179	$ 55,330	$ 34,358
Other comprehensive income, before tax:
Change in fair value of interest rate swaps	216	165	587	691
Change in fair value of available-for-sale securities			184
Unrealized gain on available-for-sale securities			150
Other comprehensive income, before tax	216	165	921	691
Income tax expense related to components of other comprehensive income	84	64	359	266
Other comprehensive income, net of tax	132	101	562	425
Comprehensive income	$ 23,610	$ 15,280	$ 55,892	$ 34,783

Note 10 - Acquisitions (Details) - USD ($) $ in Thousands				1 Months Ended	9 Months Ended
Note 10 - Acquisitions (Details) - USD ($) $ in Thousands	Jul. 01, 2014	Jun. 25, 2014	Jan. 13, 2014	May 31, 2014	Sep. 30, 2014
Selling, General and Administrative Expenses [Member] \| CNG Fuel Systems [Member]
Note 10 - Acquisitions (Details) [Line Items]
Research and Development Expense				$ 2,000
CCTTS [Member]
Note 10 - Acquisitions (Details) [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Payments to Acquire Equity Method Investments		$ 2,200
Truck Parts Depot, Inc. [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred	$ 500
CIT, Inc [Member]
Note 10 - Acquisitions (Details) [Line Items]
Business Combination, Consideration Transferred			$ 145,100
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)			83,091
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned			$ 2,000
Research and Development Expense					$ 2,000

Note 10 - Acquisitions (Details) - Purchase Price Allocation - USD ($) $ in Thousands	Sep. 30, 2014	Jan. 13, 2014	Dec. 31, 2013
CIT, Inc [Member]
Business Acquisition [Line Items]
Property and equipment		$ 60,066
Goodwill		47,326
Inventory		31,048
Accounts receivable		7,175
Prepaid expenses		750
Other		23
Accrued expenses		(1,325)
Total		$ 145,063
Goodwill	$ 263,071		$ 215,464