Document And Entity Information Note To Financial Statement Details Textual Note 3 - Earnings Per Share Income tax provision Income taxes Stock options exercised and stock awards (in shares) Note 6 - Segments ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 8 - Revenue Vesting of restricted share awards (in shares) ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 9 - Leases Trading Arrangements, by Individual [Table] Note 10 - Accumulated Other Comprehensive Income (Loss) Material Terms of Trading Arrangement [Text Block] Note 11 - Accounts Receivable and Allowance for Credit Losses Class of Stock [Domain] 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 - Segments - Segment Reporting Information (Details) Commercial Vehicle Receivables [Member] Related to commercial vehicle receivables. Note 8 - Revenue - Disaggregated Revenue by Revenue Source (Details) Product and Service, Other [Member] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Common stock repurchases (in shares) Note 9 - Leases - Rental Income (Details) Note 10 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) Goodwill, net Note 11 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Cash flows from operating activities: Cash flows from investing activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities Cash flows from financing activities: Parts and Service [Member] The performance of commercial vehicle repair services and the sale of commercial vehicle parts. us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities New and Used Commercial Vehicle [Member] Represents the information pertaining to new and used commercial vehicle. us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by (used in) financing activities 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. 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. Other Operating Segment [Member] Parts [Member] Represents the information pertaining to parts. Commercial Vehicle [Member] Represents the information pertaining to commercial vehicle. 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. Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Insurance [Member] Represents the information pertaining to insurance service. Operating Segments [Member] Accounting Policies [Abstract] Segments [Domain] us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Balance Balance Dividends declared per common share (in dollars per share) Segments [Axis] Diluted earnings per common share and common share equivalents (in dollars per share) Basic earnings per common share (in dollars per share) Numerator for basic and diluted earnings per share – Net income available to common shareholders Income Statement [Abstract] us-gaap_IncreaseDecreaseInInventories Change in inventories, net us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) us-gaap_NumberOfReportableSegments Number of Reportable Segments Provision for deferred income tax expense us-gaap_TreasuryStockCommonValue Treasury stock, at cost: 4,586,791 Class A shares and 2,352,163 Class B shares in 2026; and 4,586,791 Class A shares and 2,352,163 Class B shares in 2025 Segment Reporting [Text Block] us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Treasury Stock, Common, Shares (in shares) Treasury Stock, Common [Member] us-gaap_NetIncomeLoss Net income attributable to Rush Enterprises, Inc. Adjustments to reconcile net income to net cash provided by operating activities Award Type [Axis] Segment Reporting [Table Text Block] Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2026 and 2025 us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders’ equity us-gaap_IncreaseDecreaseInReceivables Change in accounts receivable, net us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Consolidation Items [Axis] Common Class A [Member] Lease and rental sales us-gaap_LeaseIncome Total Segment Reporting [Table] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Change in prepaid expenses and other, net Selling, general and administrative expense Stock-based compensation expense related to employee stock options and employee stock purchases Accumulated Other Comprehensive Income (Loss) [Table] Consolidation Items [Domain] Change in trade accounts payable us-gaap_IncreaseDecreaseInAccountsPayableTrade Income Tax Disclosure [Text Block] Lessee, Lease, Description [Table] Share-Based Payment Arrangement [Text Block] Restricted Stock [Member] Preferred stock, outstanding (in shares) Preferred stock, authorized (in shares) us-gaap_RestrictedCash Restricted Cash Truck Segment [Member] Represents the truck segment. Fair Value, by Balance Sheet Grouping [Table] Preferred stock, par value (in dollars per share) Change in accrued expenses us-gaap_IncreaseDecreaseInAccruedLiabilities Effect of exchange rate on cash us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect Net (decrease) increase in cash, cash equivalents and restricted cash us-gaap_TreasuryStockValueAcquiredCostMethod Common stock repurchases Draws (payments) on floor plan financing – trade, net us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Statement [Table] Effect of exchange rate on cash Statement of Financial Position [Abstract] Other income (loss), net Other Income (loss), net us-gaap_FinanceLeasePrincipalPayments Principal payments on finance lease obligations Income taxes, net of refunds us-gaap_DividendsCommonStock Cash dividends declared Cash dividends declared on Class A common stock Financing Receivable, Allowance for Credit Loss [Table Text Block] Product and Service [Domain] Product and Service [Axis] 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_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Nonlease payments Amount of payments received by lessor for non lease. Other assets, net Change in notes receivable from affiliate 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. us-gaap_PaymentsForRepurchaseOfCommonStock Common stock repurchased 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. dei_DocumentType Document Type Document Information [Line Items] dei_DocumentQuarterlyReport Document Quarterly Report Document Information [Table] Weighted average anti-dilutive options (in shares) dei_EntityInteractiveDataCurrent Entity Interactive Data Current rusha_AllocatedExpenses Allocated expenses Amount of allocated expenses. dei_DocumentTransitionReport Document Transition Report Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) rusha_ControllableExpense Controllable expenses Amount of controllable expenses. Statement [Line Items] Net income attributable to Rush Enterprises, Inc. per share of common stock: Common stock, outstanding (in shares) Award Type [Domain] Common stock, authorized (in shares) Effect of dilutive securities– Employee and director stock options and restricted share awards (in shares) Common Class B [Member] Denominator for basic earnings per share – weighted average shares outstanding (in shares) Basic (in shares) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] us-gaap_EarningsPerShareBasic Basic (in dollars per share) Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Common stock, par value $.01 per share; 105,000,000 Class A shares and 35,000,000 Class B shares authorized; 60,855,308 Class A shares and 16,715,210 Class B shares outstanding in 2026; and 60,115,093 Class A shares and 16,437,909 Class B shares outstanding in 2025 Effective Income Tax Rate Reconciliation [Table] Assets acquired under finance leases us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Comprehensive Income (Loss) Note [Text Block] Document Fiscal Period Focus Document Fiscal Year Focus Depreciation and amortization Depreciation and amortization us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income attributable to Rush Enterprises, Inc. Trade accounts payable Finance lease obligations, net of current maturities Amendment Flag Current maturities of finance lease obligations Common Stock [Member] us-gaap_SegmentExpenditureAdditionToLongLivedAssets Capital expenditures Accrued expenses Proceeds from long-term debt dei_DocumentPeriodEndDate Document Period End Date Legal Entity [Axis] Business Combination [Domain] dei_EntityFileNumber Entity File Number Operating lease obligations, net of current maturities dei_EntityTaxIdentificationNumber Entity Tax Identification Number Noncash investing and financing activities: Current maturities of operating lease obligations Business Combination [Axis] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired Business Combination, Voting Equity Interest Acquired, Percentage dei_EntityRegistrantName Entity Registrant Name dei_EntityCurrentReportingStatus Entity Current Reporting Status Business Combination [Table] dei_EntityIncorporationStateCountryCode Entity Incorporation, State or Country Code Current maturities of long-term debt Current Fiscal Year End Date Long-term debt, net of current maturities dei_EntityFilerCategory Entity Filer Category dei_EntityShellCompany Entity Shell Company dei_EntityEmergingGrowthCompany Entity Emerging Growth Company dei_EntitySmallBusiness Entity Small Business us-gaap_OperatingIncomeLoss Operating income Segment operating income (loss) Proceeds from the sale of property and equipment Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Note receivable, affiliate Notes receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. us-gaap_ContractWithCustomerAssetNet Contract with Customer, Asset, after Allowance for Credit Loss us-gaap_InterestExpense Interest expense us-gaap_Revenues Total revenue Revenues from external customers Revenues Other comprehensive income (loss), net of tax: us-gaap_BusinessCombinationConsiderationTransferred1 Business Combination, Consideration Transferred dei_EntityAddressStateOrProvince Entity Address, State or Province Loss Contingencies [Table] Statement of Stockholders' Equity [Abstract] dei_EntityAddressCityOrTown Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense Statement of Comprehensive Income [Abstract] Retained earnings dei_EntityAddressAddressLine1 Entity Address, Address Line One Statement of Cash Flows [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] dei_CityAreaCode City Area Code us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Other, net us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Taxes paid related to net share settlement of equity awards dei_LocalPhoneNumber Local Phone Number dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] Foreign currency translation adjustment Other comprehensive income (loss) attributable to Rush Enterprises, Inc. dei_Security12bTitle Title of 12(b) Security Equity Components [Axis] dei_SecurityExchangeName Security Exchange Name dei_TradingSymbol Trading Symbol Class of Stock [Axis] Equity Component [Domain] AOCI Attributable to Parent [Member] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Additional Paid-in Capital [Member] Retained Earnings [Member] Earnings Per Share [Text Block] us-gaap_CostOfGoodsAndServicesSold Costs of products sold Property and equipment, net Less: Net income loss attributable to noncontrolling interest Net income Net income Net income (loss) Provision Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Cost of products sold us-gaap_CostOfRevenue Total cost of products sold Cost of products sold us-gaap_PaymentsForProceedsFromOtherInvestingActivities Other Common stock, par value (in dollars per share) Stock-based compensation related to stock options, restricted shares and employee stock purchase plan Shareholders’ equity: Foreign currency translation adjustment Foreign currency translation Leeds Transit, Inc [Member] Represents Leeds Transit, Inc. Receivable [Domain] us-gaap_Assets Total assets Segment assets Deferred income taxes, net Cash, cash equivalents and restricted cash Fair Value Disclosures [Text Block] Share-Based Payment Arrangement, Option [Member] Supplemental disclosure of cash flow information: Current liabilities: us-gaap_LiabilitiesCurrent Total current liabilities us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Proceeds from issuance of shares related to employee stock options and employee stock purchases us-gaap_ContractWithCustomerLiability Contract with Customer, Liability Customer deposits us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Accounts receivable, net Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization Accounts and Financing Receivables [Table] Gain (loss) on sale of assets us-gaap_InvestmentIncomeInterest Interest income Receivable Type [Axis] Interest us-gaap_GainLossOnSaleOfPropertyPlantEquipment Gain on sale of property and equipment Less: Comprehensive income (loss) attributable to noncontrolling interest Accumulated other comprehensive (loss) us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest Comprehensive income us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest Total shareholders’ equity Balance Balance Inventories, net us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before taxes Parent [Member] Business Combination [Text Block] rusha_AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery Write offs Against Allowance, net of Recoveries Amount, after recovery, of writeoff of accounts receivable, charged against allowance for credit loss. Noncontrolling Interest [Member] Additional paid-in capital us-gaap_StockholdersEquity Total Rush Enterprises, Inc. shareholders’ equity Beginning balance Ending balance Change in customer deposits us-gaap_IncreaseDecreaseInContractWithCustomerLiability Noncontrolling interest Prepaid expenses and other us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Issuance of common stock under employee stock purchase plan us-gaap_PaymentsOfDividends Payments of cash dividends Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment Nature of Operation, Product Information, Concentration of Risk [Table] Current assets: Operating lease right-of-use assets, net Stock options exercised and stock awards Financial Service [Member] us-gaap_AssetsCurrent Total current assets Other long-term liabilities Vesting of restricted share awards Issuance of common stock under employee stock purchase plan (in shares) Revenue Revenue ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] us-gaap_GrossProfit Gross profit ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag]