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Note 5 - Income Taxes (Details) - Net Deferred Tax Liability (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Net Deferred Tax Liability [Abstract] |  |
Reserves and accrued liabilities | $ 6,051 | $ 5,687
Other | 2,796 | 2,714
| 8,847 | 8,401
Depreciation | 116,438 | 111,794
Prepaid expenses | 2,631 | 2,526
| 119,069 | 114,320
Net deferred tax liability | $ 110,222 | $ 105,919

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