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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2018	Jul. 31, 2018
Document Information [Line Items]
Entity Registrant Name	RUSH ENTERPRISES INC \TX\
Entity Central Index Key	0001012019
Trading Symbol	rusha
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		8,414,568
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		30,695,861

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 148,316	$ 124,541
Accounts receivable, net	201,197	183,875
Note receivable affiliate	17,368	11,914
Inventories, net	1,126,613	1,033,294
Prepaid expenses and other	12,494	11,969
Assets held for sale	6,622	9,505
Total current assets	1,512,610	1,375,098
Investments	6,025	6,375
Property and equipment, net	1,166,814	1,159,595
Goodwill, net	291,391	291,391
Other assets, net	39,623	57,680
Total assets	3,016,463	2,890,139
Current liabilities:
Floor plan notes payable	867,992	778,561
Current maturities of long-term debt	155,743	145,139
Current maturities of capital lease obligations	17,137	17,119
Trade accounts payable	150,904	107,906
Customer deposits	32,036	27,350
Accrued expenses	88,677	96,132
Total current liabilities	1,312,489	1,172,207
Long-term debt, net of current maturities	434,743	466,389
Capital lease obligations, net of current maturities	57,548	66,022
Other long-term liabilities	11,544	9,837
Deferred income taxes, net	140,061	135,311
Shareholders’ equity:
Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2018 and 2017	0	0
Common stock, par value $.01 per share; 60,000,000 Class A shares and 20,000,000 Class B shares authorized; 30,647,051 Class A shares and 8,430,123 Class B shares outstanding in 2018; and 31,345,116 Class A shares and 8,469,427 Class B shares outstanding in 2017	457	454
Additional paid-in capital	363,440	348,044
Treasury stock, at cost: 1,768,354 class A shares and 4,890,941 class B shares in 2018 and 934,171 class A shares and 4,625,181 class B shares in 2017	(166,804)	(120,682)
Retained earnings	862,985	812,557
Total shareholders’ equity	1,060,078	1,040,373
Total liabilities and shareholders’ equity	$ 3,016,463	$ 2,890,139

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Class A [Member]
Common stock, authorized (in shares)	60,000,000	60,000,000
Common stock, outstanding (in shares)	30,647,051	31,345,116
Treasury stock (in shares)	1,768,354	934,171
Common Class B [Member]
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, outstanding (in shares)	8,430,123	8,469,427
Treasury stock (in shares)	4,890,941	4,625,181

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenue	$ 1,289,838		$ 2,473,095
Lease and rental sales	58,993	$ 53,048	116,517	$ 104,292
Total revenue	1,348,831	1,203,523	2,589,612	2,248,320
Cost of products sold:
Lease and rental sales	48,663	44,206	97,091	88,510
Total cost of products sold	1,105,454	994,451	2,119,240	1,851,341
Gross profit	243,377	209,072	470,372	396,979
Selling, general and administrative expense	178,654	159,353	350,324	309,756
Depreciation and amortization expense	21,693	12,444	44,601	24,936
Gain (loss) on sale of assets	396	132	368	(31)
Operating income	43,426	37,407	75,815	62,256
Interest expense, net	4,494	2,824	8,800	5,615
Income before taxes	38,932	34,583	67,015	56,641
Provision for income taxes	9,543	12,584	16,587	20,163
Net income	$ 29,389	$ 21,999	$ 50,428	$ 36,478
Earnings per common share:
Basic (in dollars per share)	$ 0.75	$ 0.55	$ 1.27	$ 0.92
Diluted (in dollars per share)	$ 0.72	$ 0.54	$ 1.23	$ 0.90
Weighted average shares outstanding:
Basic (in shares)	39,399	39,641	39,567	39,493
Diluted (in shares)	40,690	40,839	40,967	40,737
Comprehensive income	$ 29,389	$ 22,285	$ 50,428	$ 36,764
New and Used Commercial Vehicle [Member]
Revenues:
Revenue	857,025	775,988	1,630,125	1,411,941
Cost of products sold:
Cost of products sold	791,608	718,253	1,502,522	1,306,373
Aftermarket Products and Services [Member]
Revenues:
Revenue	422,940	366,599	823,235	716,705
Cost of products sold:
Cost of products sold	265,183	231,992	519,627	456,458
Finance and Insurance [Member]
Revenues:
Revenue	5,492	4,392	10,233	8,321
Product and Service, Other [Member]
Revenues:
Revenue	$ 4,381	$ 3,496	$ 9,502	$ 7,061

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 50,428	$ 36,478
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	101,020	77,653
(Gain) loss on sale of property and equipment	(368)	31
Stock-based compensation expense related to stock options and employee stock purchases	13,842	8,660
Deferred income tax expense	4,750	2,594
Change in accounts receivable, net	(22,776)	7,067
Change in inventories, net	(65,639)	(52,425)
Change in prepaid expenses and other, net	(834)	(1,143)
Change in trade accounts payable	41,242	14,506
Draws on floor plan notes payable – trade, net	71,303	20,994
Change in customer deposits	4,686	11,330
Change in accrued expenses	(7,671)	4,977
Net cash provided by operating activities	189,983	130,722
Cash flows from investing activities:
Acquisition of property and equipment	(116,218)	(79,572)
Proceeds from the sale of property and equipment	4,239	3,192
Proceeds from the sale of available for sale securities	350	325
Change in other assets	(918)	4,887
Net cash used in investing activities	(112,547)	(71,168)
Cash flows from financing activities:
Draws on floor plan notes payable – non-trade, net	18,128	24,186
Proceeds from long-term debt	68,269	51,108
Principal payments on long-term debt	(89,311)	(74,326)
Principal payments on capital lease obligations	(6,398)	(6,647)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	1,557	12,840
Common stock repurchased	(45,906)	(24,411)
Debt issuance costs		(523)
Net cash used in financing activities	(53,661)	(17,773)
Net increase in cash and cash equivalents	23,775	41,781
Cash and cash equivalents, beginning of period	124,541	82,026
Cash and cash equivalents, end of period	148,316	123,807
Supplemental disclosure of cash flow information:
Interest	20,463	16,565
Income taxes, net of refunds	11,977	17,012
Assets acquired under capital leases	1,534	5,513
Common stock repurchased	$ 216	$ 1,798

Note 1 - Principles of Consolidation and Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
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 its 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, 2017. 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	6 Months Ended
Note 2 - Other Assets	Jun. 30, 2018
Notes to Financial Statements
Other Assets Disclosure [Text Block]	2 – Other Assets The total capitalized costs of the Company’s SAP enterprise resource planning software platform (“ERP Platform”) of $11.6 million are recorded on the Consolidated Balance Sheet in Other Assets. Amortization expense relating to the ERP Platform, which is recognized in depreciation and amortization expense in the Consolidated Statements of Income and Comprehensive Income, was $9.7 million for the three months ended June 30, 2018 and $0.8 million for the three months ended June 30, 2017 and $20.7 million for the six months ended June 30, 2018 and $1.7 million for the six months ended June 30, 2017. In the first quarter of 2018, as part of an assessment that involved a technical feasibility study of the current ERP Platform, the Company determined that a majority of the components of its ERP Platform would require replacement earlier than originally anticipated; in prior disclosures, the Company had referred to the ERP Platform separately as the SAP enterprise software and SAP dealership management system. In accordance with Accounting Standards Codification (“ASC”) Topic 350 - 40, in the first quarter of 2018, the Company adjusted the useful life of these components that were replaced so that the respective net book values of the components were fully amortized upon replacement in May 2018. The Company amortized the remaining net book value of the components that were replaced on a straight-line basis in February 2018 through May 2018. The Company recognized $10.2 million of amortization expense related to the components of the ERP Platform that were replaced in the first quarter of 2018 and $9.7 million in the second quarter of 2018. The ERP Platform asset and related amortization are reflected in the Truck Segment. 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 $7.0 million at June 30, 2018 and December 31, 2017, 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 evaluating and including all locations acquired in 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 period presented. The Company cannot predict the occurrence of certain events that might adversely affect the reported value of manufacturer franchise rights in the future.

Note 3 - Commitments and Contingencies	6 Months Ended
Note 3 - Commitments and Contingencies	Jun. 30, 2018
Notes to Financial Statements
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.

Note 4 - Earnings Per Share

6 Months Ended

Jun. 30, 2018

Notes to Financial Statements

Earnings Per Share [Text Block]

– Earnings Per Share

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	29,389	$	21,999	$	50,428	$	36,478
Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		39,399		39,641		39,567		39,493
Effect of dilutive securities– Employee stock options and restricted stock awards		1,291		1,198		1,400		1,244
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		40,690		40,839		40,967		40,737
Basic earnings per common share	$	.75	$	.55	$	1.27	$	.92
Diluted earnings per common share and common share equivalents	$	.72	$	.54	$	1.23	$	.90

Options to purchase shares of common stock that were outstanding for the

three

months and

six

months ended

June 30, 2018,

and

2017,

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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Weighted average anti-dilutive options		753		662		420		695

Note 5 - Stock Options and Restricted Stock Awards	6 Months Ended
Note 5 - Stock Options and Restricted Stock Awards	Jun. 30, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	5 – Stock Options and Restricted S tock Awards The Company accounts for stock-based compensation in accordance with ASC 718 - 10, “Compensation – Stock Compensation,” which requires the measurement and recognition of compensation expense for all share-based payment awards made to our employees and directors, including employee stock options, 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 for employee stock options, and included in selling, general and administrative expense, was $5.9 million for the three months ended June 30, 2018, and $3.9 million for the three months ended June 30, 2017. Stock-based compensation expense, included in selling, general and administrative expense, for the six months ended June 30, 2018, was $13.8 million and for the six months ended June 30, 2017, was $8.7 million. In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016 - 09, “ Co mpensation – Stock Compensation , ” (“ASU 2019 - 06” ) which changed the accounting for certain aspects of share-based payments to employees. ASU No. 2016 - 09 requires excess tax benefits and tax deficiencies to be recorded in the income statement when equity awards issued pursuant to the Company’s equity compensation plans vest or are settled. The Company recorded excess tax benefits of $0.2 million in the three months ended June 30, 2018 and $0.9 million in the three months ended June 30, 2017, which was recorded in the Consolidated Statements of Income and Comprehensive Income. The Company recorded excess tax benefits of $0.2 million in the six months ended June 30, 2018 and $2.0 million in the six months ended June 30, 2017, which was recorded in the Consolidated Statements of Income and Comprehensive Income. As of June 30, 2018, the Company had $10.5 million of unrecognized compensation cost related to non-vested employee stock options to be recognized over a weighted-average period of 3.6 years and $9.8 million of unrecognized compensation cost related to non-vested restricted stock units to be recognized over a weighted-average period of 2.3 years.

Note 6 - Financial Instruments and Fair Value

6 Months Ended

Jun. 30, 2018

Notes to Financial Statements

Fair Value Disclosures [Text Block]

– Financial Instruments and Fair Value

The Company has various financial instruments that it must measure at fair value on a recurring basis. The Company also applies the provisions of fair value measurement to various nonrecurring measurements for its financial and nonfinancial assets and liabilities.

Applicable accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company measures its assets and liabilities using inputs from the following

three

levels of the fair value hierarchy:

Level

inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level

inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are

not

active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.) and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level

includes unobservable inputs that reflect the Company’s assumptions about what factors market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.

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 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

June 30, 2018,

and

December 31, 2017.

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 its current credit standing and has categorized such debt within Level

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 Statements of Income and Comprehensive Income.

Auction Rate Securities

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

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

June 30, 2018

and

December 31, 2017,

the Company held auction rate securities with underlying tax-exempt municipal bonds that mature in

2030

and have a fair value and a cost basis of

$6.0

million and

$6.4

million, respectively. The issuer redeemed

$350,000

of the auction rate securities in

2018,

$325,000

2017,

and

$450,000

during

2016.

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

June 30, 2018

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 that 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 a 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 subsequent pre-tax increases in fair value of

$427,000

during

2014

and

$469,000

during

2017,

which brought the fair value of the auction rate securities back to their original cost basis. The Company had included the prior impairment in accumulated other comprehensive loss.

The fair values were measured using Level

inputs of the fair value hierarchy.

Long-Lived Assets

During the

first

quarter of

2016,

the Company instituted plans to consolidate its dealership network. In

2016,

the Company recorded an impairment charge related to the value of the real estate in the affected locations in the amount of

$7.5

million. The Company also classified certain excess real estate as held for sale, which resulted in an additional impairment charge.

The fair value measurements for the Company’s long-lived assets are based on Level

inputs. Fair values of the value of the real estate were determined based on evaluations by a

third

-party real estate broker that utilized its knowledge and historical experience in real estate markets and transactions. During

2016

and

2017,

the Company sold

seven

of the properties previously classified as held for sale with a fair value of

$8.3

million. During the

third

quarter of

2017,

the Company made the decision to put

one

of the properties previously classified as “held for sale” with a fair value of

$1.4

million back into service. In

February 2018,

the Company sold

one

of the properties with a fair value of

$1.9

million and in

May 2018,

the Company sold another

one

of the properties with a fair value of

$1.0

million. As of

June 30, 2018,

the remaining real estate associated with the restructuring activities is included in assets held for sale on the Consolidated Balance Sheets.

The following table presents long-lived assets classified as held for sale and measured and recorded at fair value on a nonrecurring basis (in thousands):

Description		Fair Value Measurements Using Significant Unobservable Inputs June 30, 201 8
Long-lived assets held for sale		$	6,622

- 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

6 Months Ended

Jun. 30, 2018

Notes to Financial Statements

Segment Reporting Disclosure [Text Block]

– Segment Information

The Company currently has

one

reportable business segment - the Truck Segment. The Truck Segment includes the Company’s operation of a nationwide 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 or departments within its dealerships, when making decisions about resources to be allocated to the segment and assessing 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 revenues, segment income or loss from continuing operations and segment assets for the periods ended

June 30, 2018

and

2017

(in thousands):

	Truck Segment		All Other			Total
As of and for the three months ended June 30, 201 8
Revenues from external customers	$	1,344,271	$	4,560		$	1,348,831
Segment operating income		43,126		300			43,426
Segment income before taxes		38,684		248			38,932
Segment assets		2,981,063		35,400			3,016,463

For the six months ended June 30, 201 8
Revenues from external customers	$	2,580,924	$	8,688		$	2,589,612
Segment operating income		75,486		329			75,815
Segment income before taxes		66,787		228			67,015

As of and for the three months ended June 30, 201 7
Revenues from external customers	$	1,199,703	$	3,821		$	1,203,523
Segment operating income (loss)		37,546		(139	)		37,407
Segment income (loss) before taxes		34,766		(183	)		34,583
Segment assets		2,655,860		35,939			2,691,799

For the six months ended June 30, 201 7
Revenues from external customers	$	2,240,556	$	7,764		$	2,248,320
Segment operating income (loss)		62,540		(284	)		62,256
Segment income (loss) before taxes		57,010		(368	)		56,641

Note 8 - Income Taxes	6 Months Ended
Note 8 - Income Taxes	Jun. 30, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	8 – Income Taxes The Company had unrecognized income tax benefits totaling $2.6 million as a component of accrued liabilities at June 30, 2018 and December 31, 2017, the total of which, if recognized, would impact the Company’s effective tax rate. An unfavorable settlement may require a charge to income tax expense and a favorable resolution would be recognized as a reduction to income tax expense. The Company recognizes interest accrued related to unrecognized tax benefits in income tax expense. No amounts were accrued for penalties. The Company had approximately $166,000 accrued for the payment of interest at June 30, 2018 and December 31, 2017. On December 22, 2017, the United States Congress enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“the Tax Act”). The Tax Act included, among other items, a reduction of the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018. The Tax Act made broad and complex changes to the U.S. tax code, some of which affected the Company’s 2017 year end results. Staff Accounting Bulletin No. 118 (SAB 118 ) provided guidance that allowed registrants to provide a reasonable estimate of the effects of the Tax Act in their financial statements and adjust the reported impact in a measurement period not to exceed one year. At December 31, 2017, the Company made a reasonable estimate of the effects of the Tax Act on its existing deferred tax balances and recognized a provisional net tax benefit of $82.9 million. The provisional benefit recorded was primarily a result of the remeasurement of the Company’s deferred tax assets and liabilities at the tax rate in which they will reverse when they are recognized. The Company will continue to refine its calculations as additional analysis is completed. In addition, the Company’s estimates may also be affected as it gains a more thorough understanding of the Tax Act. The Company does not anticipate a significant change in the amount of unrecognized tax benefits in the next 12 months. As of June 30, 2018, the tax years ended December 31, 2014 through 2017 remain subject to audit by federal tax authorities and the tax years ended December 31, 2013 through 2017 remain subject to audit by state tax authorities. In June 2018, the Company was notified of an examination of its federal income tax return for 2015. The Company cannot reasonably determine if this examination will have a material impact on its financial statements, and cannot predict the timing regarding resolution of this tax examination. The Company adopted ASU 2016 - 09 on January 1, 2017, which requires excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement and presented as an operating activity in the statement of cash flows when the awards are vested or are settled. The Company recorded excess tax benefits of $0.2 million for the three months ended June 30, 2018 and $0.9 million for the three months ended June 30, 2017, and $0.2 million for the six months ended June 30, 2018 and $2.0 million for the six months ended June 30, 2017, which were recorded as reductions to income tax expense in the Consolidated Statement of Income and Comprehensive Income.

Note 9 - Recent Accounting Guidance	6 Months Ended
Note 9 - Recent Accounting Guidance	Jun. 30, 2018
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	9 – Recent Accounting Guidance In February 2016, the FASB issued ASU No. 2016 - 02, “ Leases ( “ Topic 842 ” ), ” which is intended to increase the transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The new standard requires lessees to record assets and liabilities on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The Company will adopt Topic 842 on January 1, 2019. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application. Upon adoption, the Company expects to apply the practical expedients permitted within the new standard, which among other things, allows the Company to retain its existing assessment of whether an arrangement is, or contains, a lease and is classified as an operating or finance lease. The Company will make an accounting policy election that will keep leases with an initial term of 12 months or less off of the balance sheet and will result in recognizing those lease payments in the Consolidated Statements of Income and Comprehensive Income on a straight-line basis over the lease term. The Company is in the process of analyzing its lease portfolio and continues to evaluate the full impact of the new standard, including the impact on its business processes, systems, and internal controls. However, the Company expects the recognition of right-of-use assets and related liabilities to have a material effect on the Company’s Consolidated Balance Sheets.

Note 10 - Revenue

6 Months Ended

Jun. 30, 2018

Notes to Financial Statements

Revenue from Contract with Customer [Text Block]

–

Revenue

May 2014,

the FASB issued ASU

No.

2014

09,

“

Revenue from Contracts with Customers

(“Topic

606”

)

,” which amended the accounting standards for revenue recognition. The Company adopted Topic

606

January 1, 2018

and is applying the modified retrospective method. There was

not

a material impact to revenues as a result of applying Topic

606

for the

three

months and

six

months ended

June 30, 2018,

and there have

not

been significant changes to our business processes, systems, or internal controls as a result of implementing the standard. Adoption of the new standard does

not

materially change the timing or amount of revenue recognized in the Company’s Consolidated Statements of Income and Comprehensive Income.

The Company’s revenues are primarily generated from the sale of finished products to customers. Those sales predominantly contain a single delivery element and revenue for such sales is recognized when the customer obtains control, which is typically when the finished product is delivered to the customer. The Company’s material revenue streams have been identified as the following: the sale of new and used commercial vehicles, arrangement of associated commercial vehicle financing and insurance contracts, the performance of commercial vehicle repair services and the sale of commercial vehicle parts. Taxes collected from customers relating to product sales and remitted to governmental authorities are excluded from revenues.

The following table summarizes the Company’s disaggregated revenue by revenue source for the

three

months and

six

months ended

June 30, 2018 (

in thousands):

	Three Months Ended June 30, 2018		Six Months Ended June 30, 2018
Commercial vehicle sales revenue	$	857,025	$	1,630,125
Parts revenue		237,068		460,422
Commercial vehicle repair service revenue		185,872		362,813
Finance revenue		2,863		5,199
Insurance revenue		2,629		5,034
Other revenue		4,381		9,502
Total	$	1,289,838	$	2,473,095

All of the Company's performance obligations and associated revenues are generally transferred to customers at a point in time. The Company does

not

have any material contract assets or contract liabilities on the Balance Sheet as of

June 30, 2018.

Revenues related to commercial vehicle sales, parts sales, commercial vehicle repair service, finance and the majority of other revenue are related to the Truck Segment.

For the sale of new and commercial vehicles, revenue is recognized at a point in time when control is transferred to the customer, which is when delivery of the commercial vehicle occurs. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring the commercial vehicle. When control is transferred to the customer, the Company has an unconditional right to payment and a receivable is recorded for any consideration

not

received.

The Company controls the commercial vehicle before it is transferred to the customer and it obtains all of the remaining benefits from the commercial vehicle relating to the sale, ability to pledge the asset, or hold the asset. The Company is a principal in all commercial vehicle transactions. The Company retains inventory risk, determines the selling price to the customer, and delivers the commercial vehicle to the customer. The Company generally pays a commission to internal sales representatives for the sale of a commercial vehicle. The Company will continue to expense the commission and recognize it concurrently with the respective commercial vehicle sale revenue upon delivery of the commercial vehicle to a customer.

Revenue from the sale of parts is recognized when the Company transfers control of the goods to the customer and consideration has been received in the form of cash or a receivable from the customer. The Company provides its customers the right to return eligible parts, estimates the expected returns based on an analysis of historical experience and records an allowance for estimated returns, which has historically

not

been material.

Revenue from the sale of commercial vehicle repair service is recognized when the service performed by the Company on a customer’s vehicle is complete and the customer accepts the repair. Because the Company does

not

have an enforceable right to payment while the repair is being performed, revenue is recognized when the repair is complete. After a customer’s acceptance, the Company has

remaining obligations to transfer goods or services to the customer and consideration has been received in the form of cash or a receivable from the customer.

Any remaining performance obligations represent service orders for which work has

not

been completed. The Company’s service contracts are predominantly short-term in nature with a contract term of

one

month or less. For those contracts, the Company has utilized the practical expedient in Topic

606

exempting the Company from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of

one

year or less.

The Company receives commissions from

third

-party lenders for arranging customer financing for the purchase of commercial vehicles. The receipt of such commissions is deemed to be a single performance obligation that is satisfied when a financing agreement is executed and accepted by the financing provider. Once the contract has been accepted by the financing provider, the Company’s performance obligation has been satisfied and the Company generally has

further obligations under the contract. The Company is the agent in this transaction, as it does

not

have control over the acceptance of the customer’s financing arrangement by the financing provider. Consideration paid to the Company by the financing provider is based on the agreement between the Company and the financing provider.

The Company receives commissions from

third

-party insurance companies for arranging insurance coverage for customers. The receipt of such commissions is deemed to be a single performance obligation that is satisfied when the insurance coverage is bound. The Company has

further obligations under the contract. The Company is the agent in this transaction as it does

not

have control over the insurance coverage provided by the insurance carrier. Consideration paid to the Company by the insurance provider is based on the agreement between the Company and the insurance provider.

The Company records revenues from finance and insurance products at the net commission amount, which includes estimates of chargebacks that can occur if the underlying contract is

not

fulfilled. Chargeback amounts for commissions from financing companies are estimated assuming financing contracts are terminated before the customer has made

six

monthly payments. Chargeback amounts for commissions from insurance companies are estimated assuming insurance contracts are terminated before the underlying insurance contractual term has expired. Chargeback reserve amounts are based on historical chargebacks and have historically been immaterial. The Company does

not

have any right to retrospective commissions based on future profitability of finance and insurance contracts arranged.

Other revenue is mostly documentation fees that are charged to customers in connection with the sale of a commercial vehicle and recognized as other revenue when a truck is sold. The Company recognizes the documentation fees at the point in time when the commercial vehicle is delivered to the customer.

Note 11 - ERP Platform	6 Months Ended
Note 11 - ERP Platform	Jun. 30, 2018
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	1 1 – ERP Platform In February 2018, the Company determined that a majority of the components of its ERP Platform would require replacement earlier than anticipated at the time the software was installed and capitalized in 2011. In accordance with ASC Topic 350 - 40, the Company prospectively adjusted the useful life of the components to be replaced so that the respective net book values of these components were fully amortized upon replacement. The Company replaced certain components of its ERP Platform with a net book value of $19.9 million in May 2018. The Company began to amortize that amount in February 2018 and continued to amortize that amount through May 2018. The Company recorded amortization expense of $9.7 million related to replacement of the majority of its ERP Platform components during the three months ended June 30, 2018, and $19.9 million in the six months ended June 30, 2018. There has been no change in the Company’s internal control over financial reporting as a result of the replacement of the components of its ERP Platform.

Note 12 - Subsequent Event	6 Months Ended
Note 12 - Subsequent Event	Jun. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	1 2 – Subsequent Event On July 24, 2018, the Company’s Board of Directors authorized the Company to initiate a quarterly cash dividend as part of its capital allocation strategy. Accordingly, on July 24, 2018 , the Company’s Board of Directors declared an initial quarterly cash dividend of $0.12 per share of Class A and Class B Common Stock, to be paid on August 29, 2018 , to all shareholders of record as of August 8, 2018 .

Note 4 - Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	29,389	$	21,999	$	50,428	$	36,478
Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		39,399		39,641		39,567		39,493
Effect of dilutive securities– Employee stock options and restricted stock awards		1,291		1,198		1,400		1,244
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		40,690		40,839		40,967		40,737
Basic earnings per common share	$	.75	$	.55	$	1.27	$	.92
Diluted earnings per common share and common share equivalents	$	.72	$	.54	$	1.23	$	.90

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Weighted average anti-dilutive options		753		662		420		695

Note 6 - Financial Instruments and Fair Value (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

Description		Fair Value Measurements Using Significant Unobservable Inputs June 30, 201 8
Long-lived assets held for sale		$	6,622

Note 7 - Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

	Truck Segment		All Other			Total
As of and for the three months ended June 30, 201 8
Revenues from external customers	$	1,344,271	$	4,560		$	1,348,831
Segment operating income		43,126		300			43,426
Segment income before taxes		38,684		248			38,932
Segment assets		2,981,063		35,400			3,016,463

For the six months ended June 30, 201 8
Revenues from external customers	$	2,580,924	$	8,688		$	2,589,612
Segment operating income		75,486		329			75,815
Segment income before taxes		66,787		228			67,015

As of and for the three months ended June 30, 201 7
Revenues from external customers	$	1,199,703	$	3,821		$	1,203,523
Segment operating income (loss)		37,546		(139	)		37,407
Segment income (loss) before taxes		34,766		(183	)		34,583
Segment assets		2,655,860		35,939			2,691,799

For the six months ended June 30, 201 7
Revenues from external customers	$	2,240,556	$	7,764		$	2,248,320
Segment operating income (loss)		62,540		(284	)		62,256
Segment income (loss) before taxes		57,010		(368	)		56,641

Note 10 - Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30, 2018		Six Months Ended June 30, 2018
Commercial vehicle sales revenue	$	857,025	$	1,630,125
Parts revenue		237,068		460,422
Commercial vehicle repair service revenue		185,872		362,813
Finance revenue		2,863		5,199
Insurance revenue		2,629		5,034
Other revenue		4,381		9,502
Total	$	1,289,838	$	2,473,095

Note 2 - Other Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Capitalized Computer Software, Net, Ending Balance	$ 11,600			$ 11,600
Capitalized Computer Software, Amortization	9,700		$ 800	20,700	$ 1,700
Indefinite-Lived Franchise Rights	7,000			7,000		$ 7,000
Goodwill and Intangible Asset Impairment, Total				0
Components of ERP Platform Rquired Replacement [Member]
Capitalized Computer Software, Amortization	$ 9,700	$ 10,200		$ 19,900

Note 4 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$ 29,389	$ 21,999	$ 50,428	$ 36,478
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	39,399	39,641	39,567	39,493
Effect of dilutive securities– Employee stock options and restricted stock awards (in shares)	1,291	1,198	1,400	1,244
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares)	40,690	40,839	40,967	40,737
Basic earnings per common share (in dollars per share)	$ 0.75	$ 0.55	$ 1.27	$ 0.92
Diluted earnings per common share and common share equivalents (in dollars per share)	$ 0.72	$ 0.54	$ 1.23	$ 0.90

- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

Note 4 - Earnings Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted average anti-dilutive options (in shares)	753	662	420	695

Note 5 - Stock Options and Restricted Stock Awards (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ 0.2	$ 0.9	$ 0.2	$ 2.0
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	10.5		$ 10.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 219 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	9.8		$ 9.8
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 109 days
Selling, General and Administrative Expenses [Member] \| Employee Stock Option [Member]
Allocated Share-based Compensation Expense, Total	$ 5.9	$ 3.9	$ 13.8	$ 8.7

Note 6 - Financial Instruments and Fair Value (Details Textual)	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2011 USD ($)
Asset Impairment Charges, Total					$ 469,000		$ 427,000	$ 1,000,000
Impairment of Real Estate						$ 7,500,000
Number of Real Estate Properties Sold During Period	1	1			7	7
Real Estate Held-for-sale	$ 1,000,000	$ 1,900,000			$ 8,300,000	$ 8,300,000
Number of Real Estate Properties Put Back into Service			1
Real Estate Previously Held-for-sale Put Back Into Service			$ 1,400,000
Auction Rate Securities [Member]
Debt Securities, Available-for-sale, Total				$ 6,000,000	6,400,000
Auction Rate Securities Redeemed				$ 350,000	$ 325,000	$ 450,000
Derivative, Basis Spread on Variable Rate				2.25%

Note 6 - Financial Instruments and Fair Value - Pre-tax Effect of Interest Rate Swaps (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Long-lived assets held for sale, fair value	$ 6,622

Note 7 - Segment Information (Details Textual)	6 Months Ended
Note 7 - Segment Information (Details Textual)	Jun. 30, 2018
Truck Segment [Member]
Number of Reportable Segments	1
Other Segments [Member]
Number of Operating Segments	3

Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues from external customers	$ 1,348,831	$ 1,203,523	$ 2,589,612	$ 2,248,320
Segment operating income	43,426	37,407	75,815	62,256
Segment income before taxes	38,932	34,583	67,015	56,641
Segment assets	3,016,463	2,691,799	3,016,463	2,691,799	$ 2,890,139
Truck Segment [Member]
Revenues from external customers	1,344,271	1,199,703	2,580,924	2,240,556
Segment operating income	43,126	37,546	75,486	62,540
Segment income before taxes	38,684	34,766	66,787	57,010
Segment assets	2,981,063	2,655,860	2,981,063	2,655,860
Other Segments [Member]
Revenues from external customers	4,560	3,821	8,688	7,764
Segment operating income	300	(139)	329	(284)
Segment income before taxes	248	(183)	228	(368)
Segment assets	$ 35,400	$ 35,939	$ 35,400	$ 35,939

Note 8 - Income Taxes (Details Textual) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
Note 8 - Income Taxes (Details Textual) - USD ($)	Dec. 22, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 2,600,000		$ 2,600,000			$ 2,600,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued		0		0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		166,000		166,000			166,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability							$ (82,900,000)
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount		$ 200,000	$ 900,000	$ 200,000	$ 2,000,000
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Income Tax Examination, Year under Examination				2015
Domestic Tax Authority [Member] \| Latest Tax Year [Member]
Open Tax Year				2017
Domestic Tax Authority [Member] \| Earliest Tax Year [Member]
Open Tax Year				2014
State and Local Jurisdiction [Member] \| Latest Tax Year [Member]
Open Tax Year				2017
State and Local Jurisdiction [Member] \| Earliest Tax Year [Member]
Open Tax Year				2013
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						21.00%

Note 10 - Revenue - Disaggregated Revenue by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 1,289,838		$ 2,473,095
Commercial Vehicle [Member]
Revenue	857,025		1,630,125
Parts [Member]
Revenue	237,068		460,422
Commercial Vehicle Repair Service [Member]
Revenue	185,872		362,813
Financial Service [Member]
Revenue	2,863		5,199
Insurance [Member]
Revenue	2,629		5,034
Product and Service, Other [Member]
Revenue	$ 4,381	$ 3,496	$ 9,502	$ 7,061

Note 11 - ERP Platform (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	May 31, 2018
Capitalized Computer Software, Net, Ending Balance	$ 11,600			$ 11,600
Capitalized Computer Software, Amortization	9,700		$ 800	20,700	$ 1,700
Components of ERP Platform Rquired Replacement [Member]
Capitalized Computer Software, Amortization	$ 9,700	$ 10,200		$ 19,900
Components of ERP Platform Rquired Replacement [Member] \| Other Assets [Member]
Capitalized Computer Software, Net, Ending Balance						$ 19,900

Note 12 - Subsequent Event (Details Textual) - Subsequent Event [Member]	Jul. 24, 2018 $ / shares
Dividends Payable, Date Declared	Jul. 24, 2018
Dividends Payable, Date to be Paid	Aug. 29, 2018
Dividends Payable, Date of Record	Aug. 08, 2018
Common Class A [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.12
Common Class B [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.12