Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax (assets) liabilities:
Inventory	$ (5,074)	$ (6,039)
Accounts receivable	(203)	(187)
Capital lease obligations	(31,263)	(30,993)
Stock options	(11,655)	(10,719)
Accrued liabilities	(3,610)	(3,685)
State net operating loss carry forward	(1,921)	(1,570)
State tax credit	(380)	(382)
Other	(5,170)	(2,606)
Difference between book and tax basis- Depreciation and amortization	256,352	244,716
Total	197,076	188,535
Deferred Tax Assets, Valuation Allowance	255	452
Net deferred income tax liability	$ 197,331	$ 188,987