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Note 5 - Income Taxes - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued liabilities | $ 12,050 | $ 9,050
Other | 1,768 | 2,464
Deferred Tax Assets, Gross, Total | 13,818 | 11,514
Deferred tax liabilities: |  |
Depreciation | 131,650 | 130,686
Prepaid expenses | 3,266 | 2,850
Deferred Tax Liabilities, Gross, Total | 134,916 | 133,536
Net deferred tax liability | $ 121,098 | $ 122,022

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