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Note 5 - Income Taxes - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued liabilities | $ 13,126 | $ 13,244
Other | 1,212 | 1,597
Deferred Tax Assets, Gross | 14,338 | 14,841
Deferred tax liabilities: |  |
Depreciation | 133,634 | 148,285
Prepaid expenses | 3,166 | 3,597
Deferred Tax Liabilities, Gross | 136,800 | 151,882
Net deferred tax liability | $ 122,462 | $ 137,041

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