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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
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