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Note 13 - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax (assets) liabilities:    
Inventory $ (6,039,000) $ (6,786,000)
Accounts receivable (187,000) (304,000)
Capital lease obligations (30,993,000) (21,182,000)
Stock options (10,719,000) (8,820,000)
Accrued liabilities (3,685,000) (3,935,000)
State net operating loss carry forward (1,570,000) (1,436,000)
State tax credit (382,000) (354,000)
Other (2,606,000) (1,839,000)
Difference between book and tax basis- Depreciation and amortization 244,716,000 201,495,000
Total 188,535,000 156,839,000
Deferred Tax Assets, Valuation Allowance 452,000 409,000
Net deferred income tax liability $ 188,987,000 $ 157,248,000