Document And Entity Information us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill Franchise rights Note To Financial Statement Details Textual Note 3 - Earnings Per Share Note 6 - Segment Information Note 8 - Revenue Note 9 - Leases Note 10 - Accumulated Other Comprehensive Income (Loss) Note 11 - Accounts Receivable and Allowance for Credit Losses Other Receivables [Member] Related to other receivables. Note 12 - Acquisition Leasing, Parts and Service Receivables [Member] Related to leasing, parts and service receivables. Note 3 - Earnings Per Share - Earnings Per Share Calculation (Details) Manufacturers' Receivables [Member] Related to manufacturers' receivables. us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Accounts receivable Note 3 - Earnings Per Share - Anti-dilutive Securities (Details) Income Tax Disclosure [Text Block] Commercial Vehicle Receivables [Member] Related to commercial vehicle receivables. Note 6 - Segment Information - Segment Reporting Information (Details) Note 8 - Revenue - Disaggregated Revenue by Revenue Source (Details) Cash Note 9 - Leases - Rental Income (Details) Other assets, net Stock-based compensation expense related to stock options and employee stock purchases us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory Inventory Note 10 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Details) us-gaap_LiabilitiesCurrent Total current liabilities Note 11 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) Note 12 - Acquisition - Fair Values of Assets and Liabilities Acquired (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Revenues from external customers us-gaap_Revenues Total revenue Parts and Service [Member] The performance of commercial vehicle repair services and the sale of commercial vehicle parts. New and Used Commercial Vehicle [Member] Represents the information pertaining to new and used commercial vehicle. Lease and rental sales The aggregate cost related to the lease and rental service. us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired Business Acquisition, Percentage of Voting Interests Acquired Finance and Insurance [Member] Represents the information pertaining to finance and insurance. Foreign currency translation Reclassification of foreign currency translation related to equity method Floor plan notes payable Amounts borrowed to finance the purchase of new and used commercial vehicle inventory. Commercial Vehicle Repair Service [Member] Represents the information pertaining to commercial vehicle repair service. Parts [Member] Represents the information pertaining to parts. us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 Stockholders' Equity Note, Stock Split, Conversion Ratio Commercial Vehicle [Member] Represents the information pertaining to commercial vehicle. Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization Draws on floor plan notes payable – non-trade, net The net change during the reporting period in commercial vehicle floor plan due by the reporting entity. Current maturities of long-term debt Other comprehensive income (loss), net of tax: Insurance [Member] Represents the information pertaining to insurance service. us-gaap_AssetsCurrent Total current assets us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Total shareholders’ equity Balance Balance Treasury Stock, Common, Shares (in shares) Common stock, par value $.01 per share; 105,000,000 Class A shares and 35,000,000 Class B shares authorized; 62,053,249 Class A shares and 17,989,388 Class B shares outstanding in 2023; and 63,518,042 Class A shares and 18,124,627 Class B shares outstanding in 2022 Goodwill, net Goodwill, Gross Adjustments to reconcile net income to net cash provided by operating activities: Common stock, authorized (in shares) Common Stock, Shares Authorized Customer deposits Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Accrued expenses Statistical Measurement [Domain] Maximum [Member] Minimum [Member] Ownership [Domain] Product and Service [Axis] Revolving Credit Facility [Member] Product and Service [Domain] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Statistical Measurement [Axis] Investment, Name [Domain] Proceeds from the sale of property and equipment Credit Facility [Axis] Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2023 and 2022 Ownership [Axis] Credit Facility [Domain] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Interest us-gaap_PolicyTextBlockAbstract Accounting Policies Investment, Name [Axis] Preferred stock, authorized (in shares) Inventories, net Preferred stock, par value (in dollars per share) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment Effect of dilutive securities– Employee stock options and restricted share awards (in shares) Noncash investing and financing activities: Assets acquired under finance leases Trade accounts payable Product and Service, Other [Member] rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFloorPlanNotesPayable Floor plan notes payable Amount of floor plan notes payable, assumed at the acquisition date. Current liabilities: rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTradesPayables Trade payables This item represents trades payable associated with restructuring or exit activities of the acquiree, existing at the acquisition date (present liabilities of the acquiree). Truck Segment [Member] Represents the truck segment. rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerDeposits Customer deposits The amount of customer deposits assumed (as defined) which have been recognized as of the acquisition date. Other Income (Expense) [Member] Other Income (Expense). rusha_DeferredTaxLiabilitiesReclassificationOfForeignCurrencyTranslationAdjustment Deferred Tax Liabilities, Reclassification of Foreign Currency Translation Adjustment Amount of deferred tax liability attributable to taxable temporary differences from reclassification of foreign currency translation adjustment. Segment assets us-gaap_Assets Total assets Supplemental disclosure of cash flow information: rusha_DeferredTaxLiabilitiesRemeasurementOfEquityMethodInvestment Deferred Tax Liabilities, Re-measurement of Equity Method Investment Amount of deferred tax liability attributable to taxable temporary differences from re-measurement of equity method investment. rusha_OtherComprehensiveIncomeLossForeignCurrencyTranslationReclassificationRelatedToEquityMethodAccountingNetOfTax Reclassification of currency translation related to equity method accounting Amount after tax of reclassification adjustment from accumulated other comprehensive income for foreign currency transaction reclassification related to equity method accounting. Noncontrolling interest rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities Accrued liabilities The amount of accrued liabilities assumed (as defined) which have been recognized as of the acquisition date. rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNotesPayable Notes payable The amount of notes payable assumed (as defined) which have been recognized as of the acquisition date. Cash flows from operating activities: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount rusha_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestMeasurementInputs Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Measurement Inputs Value of input used to measure noncontrolling interest in the acquiree at the acquisition date. us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Schedule of Segment Reporting Information, by Segment [Table Text Block] Statement [Line Items] us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Balance Balance Accounts receivable, net us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Revenues Share-Based Payment Arrangement [Text Block] Additional paid-in capital AOCI Attributable to Parent [Member] Shareholders’ equity: Other income (expense) Segment Reporting Disclosure [Text Block] Award Type [Domain] Current assets: Numerator for basic and diluted earnings per share – Net income available to common shareholders Fair Value Disclosures [Text Block] us-gaap_NetIncomeLoss Net income attributable to Rush Enterprises, Inc. Award Type [Axis] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Effect of exchange rate on cash Less: Net income attributable to noncontrolling interest us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities Restricted Stock [Member] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect Net (decrease) increase in cash, cash equivalents and restricted cash Segment operating income us-gaap_OperatingIncomeLoss Operating income rusha_LessorLeasesTermOfContract Lessor, Leases, Term of Contract Term of lessor's leases, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Share-Based Payment Arrangement, Option [Member] Prepaid expenses and other us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Leases of Lessee and Lessor Disclosure [Text Block] The entire disclosure for lessee and lessor entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. us-gaap_CostOfRevenue Total cost of products sold us-gaap_GrossProfit Gross profit rusha_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets Other The amount of other assets recognized as of the acquisition date. us-gaap_CostOfGoodsAndServicesSold Costs of products sold Deferred income taxes, net Less: Comprehensive income attributable to noncontrolling interest Nonlease payments Amount of payments received by lessor for non lease. Minimum rental payments Amount of lease payments received by lessor for leases. Leases, Lease Income [Table Text Block] Tabular disclosure of components of income from leases. Commitments and Contingencies Disclosure [Text Block] Business Combination Disclosure [Text Block] Property and equipment, net rusha_PrincipalRepaymentsOfLongtermDebt Principal payments on long-term debt The cash outflow for principal of debt initially having maturity due after one year or beyond the normal operating cycle, if longer. rusha_GainLossOnJointVentureTransaction Gain on joint venture transaction The amount of gain (loss) on joint venture transaction. us-gaap_Goodwill Goodwill Noncontrolling interest equity us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Taxes paid related to net share settlement of equity awards RTC Canada [Member] Represents RTC Canada. us-gaap_PaymentsOfDividends Payments of cash dividends us-gaap_EquityMethodInvestmentOwnershipPercentage Equity Method Investment, Ownership Percentage Net income Net income us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest Comprehensive income Cost of products sold Noncontrolling Interest [Member] Cash flows from investing activities: us-gaap_PaymentsForRepurchaseOfCommonStock Common stock repurchased us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Other, net Net income attributable to Rush Enterprises, Inc. per share of common stock: Retained Earnings [Member] Earnings Per Share [Text Block] Revenue Revenue Treasury Stock, Common [Member] Proceeds from issuance of shares relating to employee stock options and employee stock purchases Additional Paid-in Capital [Member] Parent [Member] Common Stock [Member] Income tax provision Change in accrued expenses us-gaap_IncreaseDecreaseInAccruedLiabilities Equity Components [Axis] Equity Component [Domain] Segment income before taxes us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before taxes Stock Split From [Member] Represents the stock split from. Stock Split To [Member] Represents the stock split to. rusha_AdditionalShareIssuedForEveryTwoSharesOfCommonStock Additional Share Issued for Every Two Shares of Common Stock The additional share issued for every two shares of common stock. Change in trade accounts payable us-gaap_IncreaseDecreaseInAccountsPayableTrade Comprehensive Income (Loss) Note [Text Block] us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue Restricted Cash and Cash Equivalents, Current Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Cash, cash equivalents and restricted cash State and Local Jurisdiction [Member] Income Tax Authority [Axis] Income Tax Authority [Domain] Disaggregation of Revenue [Table Text Block] us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Domestic Tax Authority [Member] Revenue from Contract with Customer [Text Block] Document Quarterly Report dei_EntityIncorporationStateCountryCode Entity Incorporation, State or Country Code Amendment Flag us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounting Policies [Abstract] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income attributable to Rush Enterprises, Inc. us-gaap_OpenTaxYear Open Tax Year Document Transition Report dei_CityAreaCode City Area Code us-gaap_TreasuryStockSharesRetired Treasury Stock, Shares, Retired Selling, General and Administrative Expenses [Member] Entity Interactive Data Current Dividends declared per common share (in dollars per share) us-gaap_GainLossOnSaleOfPropertyPlantEquipment Gain on sale of property and equipment us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Change in customer deposits us-gaap_IncreaseDecreaseInContractWithCustomerLiability Security Exchange Name Common stock, outstanding (in shares) Preferred stock, outstanding (in shares) Financing Receivable, Allowance for Credit Loss [Table Text Block] Title of 12(b) Security us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Current Fiscal Year End Date Proceeds from long-term debt us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Receivable Type [Axis] Receivable [Domain] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Change in prepaid expenses and other, net Document Fiscal Period Focus Document Fiscal Year Focus dei_DocumentPeriodEndDate Document Period End Date Income Statement Location [Axis] Income Statement Location [Domain] dei_EntityFileNumber Entity File Number Nonmonetary Transaction Type [Domain] Entity Emerging Growth Company dei_DocumentType Document Type Entity Small Business Entity Shell Company Nonmonetary Transaction Type [Axis] Document Information [Line Items] Document Information [Table] us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners Subsidiary, Ownership Percentage, Noncontrolling Owner Deposits for Restrictions Related to Captive Insurance Company [Member] Represents deposits for restriction related to captive insurance company. Entity Filer Category Entity Current Reporting Status us-gaap_DividendsCommonStock Cash dividends declared Segments [Axis] Segments [Domain] Other Segments [Member] rusha_LineOfCreditFacilityMinimumBalanceThreshold Line of Credit Facility, Minimum Balance Threshold The minimum balance threshold of the line of credit facility. Variable Rate [Domain] rusha_DebtInstrumentPrimeRateFloor Debt Instrument, Prime Rate Floor The prime rate floor of the debt instrument. us-gaap_IncreaseDecreaseInReceivables Change in accounts receivable, net Prime Rate [Member] Anti-dilutive options – weighted average (in shares) Diluted (in shares) Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) Variable Rate [Axis] Stock-based compensation related to stock options, restricted shares and employee stock purchase plan Statement of Comprehensive Income [Abstract] dei_EntityTaxIdentificationNumber Entity Tax Identification Number Entity Central Index Key Lease and rental sales us-gaap_LeaseIncome Total Depreciation and amortization expense dei_EntityRegistrantName Entity Registrant Name Entity [Domain] Retirement of treasury shares and par value adjustment Retirement of treasury shares and par value adjustment Legal Entity [Axis] Statement [Table] dei_EntityAddressAddressLine1 Entity Address, Address Line One Statement of Financial Position [Abstract] us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Denominator for basic earnings per share – weighted average shares outstanding (in shares) Basic (in shares) us-gaap_TreasuryStockValueAcquiredCostMethod Common stock repurchases dei_EntityAddressCityOrTown Entity Address, City or Town Diluted earnings per common share and common share equivalents (in dollars per share) dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock, at cost: 266,519 Class A shares and 105,924 Class B shares in 2023; and 1,626,777 Class A shares and 1,112,446 Class B shares in 2022 us-gaap_EarningsPerShareBasic Basic (in dollars per share) Business Acquisition [Axis] dei_EntityAddressStateOrProvince Entity Address, State or Province Business Acquisition, Acquiree [Domain] Basic earnings per common share (in dollars per share) Statement of Cash Flows [Abstract] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Statement of Stockholders' Equity [Abstract] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Common stock repurchases (in shares) Income Statement [Abstract] Foreign currency translation adjustment Other comprehensive income (loss) attributable to Rush Enterprises, Inc. us-gaap_IncreaseDecreaseInInventories Change in inventories, net Trading Symbol Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Issuance of common stock under employee stock purchase plan (in shares) dei_LocalPhoneNumber Local Phone Number Stock options exercised and stock awards (in shares) us-gaap_TableTextBlock Notes Tables Gain on sale of assets Issuance of common stock under employee stock purchase plan us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss Gain on equity method investment Vesting of restricted share awards (in shares) us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Stock options exercised and stock awards us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage Vesting of restricted share awards us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain Gain on business acquisition Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value Selling, general and administrative expense us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Noncontrolling interest Current period provision us-gaap_PaymentsForProceedsFromOtherInvestingActivities Other Cash flows from financing activities: Other long-term liabilities us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders’ equity Retained earnings Accumulated other comprehensive income (loss) rusha_AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery Write offs against allowance, net of recoveries Amount, after recovery, of writeoff of accounts receivable, charged against allowance for credit loss. Measurement Input, Discount Rate [Member] Issuer Rule 10b5-1, Material Terms [Text Block] The entire disclosure for material terms under issuer rule 10b5-1. Business disposition us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet Equity investment in RTC Canada Interest expense, net Cash and Cash Equivalents [Domain] Total us-gaap_StockholdersEquity Total Rush Enterprises, Inc. shareholders’ equity Balance Balance Common Class A [Member] Restricted Cash and Cash Equivalents [Axis] us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Common Class B [Member] Operating lease obligations, net of current maturities Subsequent Event [Member] Class of Stock [Axis] Class of Stock [Domain] Long-term debt, net of current maturities Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_PaymentsToAcquireBusinessesGross Business acquisition, net of cash acquired Current maturities of operating lease obligations Subsequent Event Type [Axis] Subsequent Event Type [Domain] Current maturities of finance lease obligations Finance lease obligations, net of current maturities Financial Service [Member] Subsequent Events [Text Block] Operating lease right-of-use assets, net us-gaap_FinanceLeasePrincipalPayments Principal payments on finance lease obligations Provision for deferred income tax expense Measurement Input Type [Axis] Measurement Input Type [Domain] us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment Property and equipment, including real estate