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Note 12 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 102,169 | $ 84,081
Unrealized gains on securities | 2,894 | 2,580
Prepaid expenses and other | 3,836 | 2,783
Total deferred tax liabilities | 108,899 | 89,444
Deferred tax assets: |  |
Current expected credit losses | 1,385 | 1,165
Compensated absences | 215 | 185
Self-insurance allowances | 5,746 | 1,207
Other | 108 | 172
Total deferred tax assets | 7,454 | 2,729
Net deferred tax liability | $ 101,445 | $ 86,715

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