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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax (assets) liabilities:
Inventory	$ (4,329)	$ (5,086)
Accounts receivable	(168)	(140)
Finance lease obligations	(27,522)	(21,618)
Finance and operating leases	(13,607)	(12,726)
Stock options	(7,463)	(8,749)
Accrued liabilities	(7,680)	(2,989)
State net operating loss carry forward	(1,101)	(2,381)
State tax credit	(193)	(196)
Other	(3,302)	(3,817)
Difference between book and tax basis- Operating lease assets	13,444	12,628
Difference between book and tax basis- Depreciation and amortization	178,360	209,250
Total	126,439	164,176
Deferred Tax Assets, Valuation Allowance, Total	0	121
Net deferred income tax liability	$ 126,439	$ 164,297

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