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Note 13 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Inventory $ 4,673 $ 4,424
Accounts receivable 304 164
Capital lease obligations 3,821 4,604
Stock options 1,474 1,409
Accrued liabilities 4,531 2,337
State net operating loss carry forward 1,071 905
State tax credit 403 477
Other   310
Current deferred tax asset 16,277 14,630
Deferred tax assets:    
Capital lease obligations 13,002 13,811
Stock options 5,894 5,635
Other 1,821 1,679
20,717 21,125
Difference between book and tax basis-    
Depreciation and amortization (168,539) (144,881)
Net non-current tax liability $ (147,822) $ (123,756)