Note 13 - Income Taxes (Detail) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Inventory	$ 4,424	$ 2,944
Accounts receivable	164	178
Capital lease obligations	4,604	4,217
Stock options	1,409	1,145
Accrued liabilities	2,337	2,453
State net operating loss carry forward	905	393
State tax credit	477	527
Other	310	429
Current deferred tax asset	14,630	12,286
Deferred tax assets:
Capital lease obligations	13,811	12,651
Stock options	5,635	4,579
Other	1,679	1,231
	21,125	18,461
Difference between book and tax basis-
Depreciation	(144,881)	(111,584)
Net non-current tax liability	$ (123,756)	$ (93,123)