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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax (assets) liabilities: |  |
Inventory | $ (3,637) | $ (5,074)
Accounts receivable | (157) | (203)
Capital lease obligations | (19,480) | (31,263)
Stock options | (6,899) | (11,655)
Accrued liabilities | (2,533) | (3,610)
State net operating loss carry forward | (2,262) | (1,921)
State tax credit | (410) | (380)
Other | (3,627) | (5,170)
Difference between book and tax basis- Depreciation and amortization | 174,266 | 256,352
Total | 135,261 | 197,076
Deferred Tax Assets, Valuation Allowance | 50 | 255
Net deferred income tax liability | $ 135,311 | $ 197,331

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