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Note 5 - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued liabilities | $ 8,490 | $ 7,219
Other | 2,757 | 2,721
| 11,247 | 9,940
Deferred tax liabilities: |  |
Depreciation | 155,936 | 141,255
Prepaid expenses | 3,165 | 3,049
| 159,101 | 144,304
Net deferred tax liability | $ 147,854 | $ 134,364

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