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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax (assets) liabilities: |  |
Inventory | $ (4,076) | $ (3,637)
Accounts receivable | (231) | (157)
Capital lease obligations | (16,202) | (19,480)
Stock options | (9,026) | (6,899)
Accrued liabilities | (2,481) | (2,533)
State net operating loss carry forward | (2,463) | (2,262)
State tax credit | (312) | (410)
Other | (3,276) | (3,627)
Difference between book and tax basis- Depreciation and amortization | 179,325 | 174,266
Total | 141,258 | 135,261
Deferred Tax Assets, Valuation Allowance, Total | 50 | 50
Net deferred income tax liability | $ 141,308 | $ 135,311

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