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Note 13 - Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Deferred income tax (assets) liabilities: |  |
Inventory | $ (6,039,000) | $ (6,786,000)
Accounts receivable | (187,000) | (304,000)
Capital lease obligations | (30,993,000) | (21,182,000)
Stock options | (10,719,000) | (8,820,000)
Accrued liabilities | (3,685,000) | (3,935,000)
State net operating loss carry forward | (1,570,000) | (1,436,000)
State tax credit | (382,000) | (354,000)
Other | (2,606,000) | (1,839,000)
Difference between book and tax basis- Depreciation and amortization | 244,716,000 | 201,495,000
Total | 188,535,000 | 156,839,000
Deferred Tax Assets, Valuation Allowance | 452,000 | 409,000
Net deferred income tax liability | $ 188,987,000 | $ 157,248,000

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