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Note 13 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 78,502 | $ 60,388
Unrealized gains on securities | 2,580 | 2,580
Prepaid expenses and other | 2,667 | 2,603
Total deferred tax liabilities | 83,749 | 65,571
Deferred tax assets: |  |
Allowance for doubtful accounts | 572 | 344
QAFMV tax credit carryforward | 864 | 864
New hire tax credit | 124 | 124
Compensated absences | 460 | 410
Self-insurance allowances | 188 | 149
Share-based compensation |  | 61
Marketable equity securities | 2,200 | 750
Net operating loss carryover | 17,241 | 7,975
Other | 203 | 203
Total deferred tax assets | 21,852 | 10,880
Net deferred tax liability | $ 61,897 | $ 54,691

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