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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, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 84,081 | $ 100,736
Unrealized gains on securities | 2,580 | 2,580
Prepaid expenses and other | 2,783 | 2,599
Total deferred tax liabilities | 89,444 | 105,915
Deferred tax assets: |  |
Current expected credit losses | 1,165 | 896
Tax credit carryforwards | 0 | 988
Compensated absences | 185 | 189
Self-insurance allowances | 1,207 | 674
Marketable equity securities | 0 | 2,129
Net operating loss carryover | 0 | 32,031
Other | 172 | 125
Total deferred tax assets | 2,729 | 37,032
Net deferred tax liability | $ 86,715 | $ 68,883

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