Document And Entity Information 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 3 - Earnings Per Share - Earnings Per Share Calculation (Details) Leasing, Parts and Service Receivables [Member] Related to leasing, parts and service receivables. Note 3 - Earnings Per Share - Anti-dilutive Securities (Details) Manufacturers' Receivables [Member] Related to manufacturers' receivables. Note 6 - Segment Information - Segment Reporting Information (Details) Income Tax Disclosure [Text Block] Commercial Vehicle Receivables [Member] Related to commercial vehicle receivables. Note 8 - Revenue - Disaggregated Revenue by Revenue Source (Details) Note 9 - Leases - Rental Income (Details) Note 10 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) Other assets, net Stock-based compensation expense related to stock options and employee stock purchases Note 11 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) us-gaap_LiabilitiesCurrent Total current liabilities 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. Finance and Insurance [Member] Represents the information pertaining to finance and insurance. Foreign currency translation adjustment Foreign currency translation 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. 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; 62,307,564 Class A shares and 16,695,873 Class B shares outstanding in 2024; and 61,461,281 Class A shares and 16,364,158 Class B shares outstanding in 2023 Goodwill, net 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) Accrued expenses Statistical Measurement [Domain] Maximum [Member] Minimum [Member] Product and Service [Axis] Product and Service [Domain] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Statistical Measurement [Axis] Proceeds from the sale of property and equipment Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2024 and 2023 Interest us-gaap_PolicyTextBlockAbstract Accounting Policies Preferred stock, authorized (in shares) Inventories, net us-gaap_PaymentsToAcquireProductiveAssets Payments to Acquire Productive Assets Preferred stock, par value (in dollars per share) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment Employee and director stock options and restricted share awards (in shares) Nebraska Peterbilt [Member] Represents Nebraska Peterbilt. Noncash investing and financing activities: Assets acquired under finance leases Income taxes, net of refunds Trade accounts payable Product and Service, Other [Member] Current liabilities: Truck Segment [Member] Represents the truck segment. Segment assets us-gaap_Assets Total assets Supplemental disclosure of cash flow information: Noncontrolling interest Cash flows from operating activities: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 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] us-gaap_ContractWithCustomerAssetNet Contract with Customer, Asset, after Allowance for Credit Loss 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 increase(decrease) 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 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. Shareholders’ equity: Commitments and Contingencies Disclosure [Text Block] us-gaap_ContractWithCustomerLiability Contract with Customer, Liability 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. us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Taxes paid related to net share settlement of equity awards us-gaap_PaymentsOfDividends Payments of cash dividends Net income Net income us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest Comprehensive income Cost of products sold Noncontrolling Interest [Member] 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. Change in trade accounts payable us-gaap_IncreaseDecreaseInAccountsPayableTrade us-gaap_RestrictedCash Restricted Cash Comprehensive Income (Loss) Note [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Cash, cash equivalents and restricted cash Interest expense, net State and Local Jurisdiction [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Domain] Disaggregation of Revenue [Table Text Block] us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Domestic Tax Jurisdiction [Member] Revenue from Contract with Customer [Text Block] Notes receivable from affiliate Notes receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. 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 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 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 Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [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] Entity Filer Category Entity Current Reporting Status us-gaap_DividendsCommonStock Cash dividends declared Segments [Axis] Segments [Domain] Other Operating Segment [Member] us-gaap_IncreaseDecreaseInReceivables Change in accounts receivable, net 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) 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] 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 ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] dei_EntityAddressCityOrTown Entity Address, City or Town Diluted earnings per common share and common share equivalents (in dollars per share) ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock, at cost: 1,299,589 Class A shares and 1,750,566 Class B shares in 2024; and 1,092,142 Class A shares and 1,731,157 Class B shares in 2023 us-gaap_EarningsPerShareBasic Basic (in dollars per share) dei_EntityAddressStateOrProvince Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Basic earnings per common share (in dollars per share) Material Terms of Trading Arrangement [Text Block] us-gaap_StockRepurchasedDuringPeriodShares Common stock repurchases (in shares) Statement of Cash Flows [Abstract] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Statement of Stockholders' Equity [Abstract] us-gaap_StockRepurchasedAndRetiredDuringPeriodValue Retirement of treasury shares and par value adjustment 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 Freeway Ford Truck Sales, Inc. [Member] Relating to Freeway Ford Truck Sales, Inc. Stock options exercised and stock awards (in shares) us-gaap_TableTextBlock Notes Tables Gain on disposition of assets Issuance of common stock under employee stock purchase plan Vesting of restricted share awards (in shares) Stock options exercised and stock awards Vesting of restricted share awards Asset Acquisition [Axis] Selling, general and administrative expense Provision us-gaap_PaymentsForProceedsFromOtherInvestingActivities Other Principal payments on long-term debt Other long-term liabilities Asset Acquisition [Domain] 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. us-gaap_StockholdersEquity Total Rush Enterprises, Inc. shareholders’ equity Balance Balance Common Class A [Member] us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Common Class B [Member] Operating lease obligations, net of current maturities 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 Current maturities of finance lease obligations Finance lease obligations, net of current maturities Financial Service [Member] Operating lease right-of-use assets, net us-gaap_FinanceLeasePrincipalPayments Principal payments on finance lease obligations Provision for deferred income tax expense