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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, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 83,453 | $ 78,502
Unrealized gains on securities | 2,580 | 2,580
Prepaid expenses and other | 2,193 | 2,667
Total deferred tax liabilities | 88,226 | 83,749
Deferred tax assets: |  |
Allowance for doubtful accounts | 760 | 572
QAFMV tax credit carryforward | 864 | 864
New hire tax credit | 124 | 124
Compensated absences | 512 | 460
Self-insurance allowances | 5,630 | 188
Marketable equity securities | 1,253 | 2,200
Net operating loss carryover | 15,364 | 17,241
Other | 198 | 203
Total deferred tax assets | 24,705 | 21,852
Net deferred tax liability | $ 63,521 | $ 61,897

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