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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred income tax (assets) liabilities: |  |
Inventory | $ (2,704) | $ (4,329)
Accounts receivable | (349) | (168)
Finance lease obligations | (27,242) | (27,522)
Finance and operating leases | (16,379) | (13,607)
Stock options | (6,993) | (7,463)
Accrued liabilities | (5,768) | (7,680)
State net operating loss carry forward | (1,438) | (1,101)
State tax credit | (120) | (193)
Other | (2,765) | (3,302)
Difference between book and tax basis- Operating lease assets | 16,132 | 13,444
Difference between book and tax basis- Depreciation and amortization | 188,099 | 178,360
Net deferred income tax liability | $ 140,473 | $ 126,439

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