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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax (assets) liabilities: |  |
Inventory | $ (5,086) | $ (4,076)
Accounts receivable | (140) | (231)
Finance lease obligations | (21,618) | (16,202)
Finance and operating leases | (12,726) | 0
Stock options | (8,749) | (9,026)
Accrued liabilities | (2,989) | (2,481)
State net operating loss carry forward | (2,381) | (2,463)
State tax credit | (196) | (312)
Other | (3,817) | (3,276)
Difference between book and tax basis- Operating lease assets | 12,628 | 0
Difference between book and tax basis- Depreciation and amortization | 209,250 | 179,325
Total | 164,176 | 141,258
Deferred Tax Assets, Valuation Allowance, Total | 121 | 50
Net deferred income tax liability | $ 164,297 | $ 141,308

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