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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, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 100,736 | $ 83,453
Unrealized gains on securities | 2,580 | 2,580
Prepaid expenses and other | 2,599 | 2,193
Total deferred tax liabilities | 105,915 | 88,226
Deferred tax assets: |  |
Current expected credit losses | 896 | 760
Tax credit carryforwards | 988 | 988
Compensated absences | 189 | 512
Self-insurance allowances | 674 | 5,630
Marketable equity securities | 2,129 | 1,253
Net operating loss carryover | 32,031 | 15,364
Other | 125 | 197
Total deferred tax assets | 37,032 | 24,704
Net deferred tax liability | $ 68,883 | $ 63,522

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