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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
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Deferred tax assets: |  |
Inventory | $ 6,786 us-gaap_DeferredTaxAssetsInventory | $ 4,673 us-gaap_DeferredTaxAssetsInventory
Accounts receivable | 304 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 304 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Capital lease obligations | 4,217 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 3,821 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Stock options | 1,764 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,474 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued liabilities | 3,935 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 4,531 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
State net operating loss carry forward | 1,436 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 1,071 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
State tax credit | 354 us-gaap_DeferredTaxAssetsOtherTaxCarryforwards | 403 us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
| 18,796 us-gaap_DeferredTaxAssetsGrossCurrent | 16,277 us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance | (409)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent |
Current deferred tax asset | 18,387 us-gaap_DeferredTaxAssetsNetCurrent | 16,277 us-gaap_DeferredTaxAssetsNetCurrent
Non-Current: |  |
Capital lease obligations | 16,965 rusha_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOtherNoncurrent | 13,002 rusha_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOtherNoncurrent
Stock options | 7,056 rusha_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent | 5,894 rusha_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostNoncurrent
Other | 1,839 rusha_DeferredTaxAssetsOtherNoncurrent | 1,821 rusha_DeferredTaxAssetsOtherNoncurrent
| 25,860 us-gaap_DeferredTaxAssetsGrossNoncurrent | 20,717 us-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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