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Note 13 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Inventory	$ 6,786us-gaap_DeferredTaxAssetsInventory	$ 4,673us-gaap_DeferredTaxAssetsInventory
Accounts receivable	304us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	304us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Capital lease obligations	4,217us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	3,821us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Stock options	1,764us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1,474us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued liabilities	3,935us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	4,531us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
State net operating loss carry forward	1,436us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	1,071us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
State tax credit	354us-gaap_DeferredTaxAssetsOtherTaxCarryforwards	403us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
	18,796us-gaap_DeferredTaxAssetsGrossCurrent	16,277us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance	(409)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Current deferred tax asset	18,387us-gaap_DeferredTaxAssetsNetCurrent	16,277us-gaap_DeferredTaxAssetsNetCurrent
Non-Current:
Capital lease obligations	16,965rusha_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOtherNoncurrent	13,002rusha_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOtherNoncurrent
Stock options	7,056rusha_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent	5,894rusha_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent
Other	1,839rusha_DeferredTaxAssetsOtherNoncurrent	1,821rusha_DeferredTaxAssetsOtherNoncurrent
	25,860us-gaap_DeferredTaxAssetsGrossNoncurrent	20,717us-gaap_DeferredTaxAssetsGrossNoncurrent
Deferred tax liabilities:
Depreciation and amortization	(201,495)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(168,539)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net non-current tax liability	$ (175,635)us-gaap_DeferredTaxLiabilitiesNoncurrent	$ (147,822)us-gaap_DeferredTaxLiabilitiesNoncurrent

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