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Note 11 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 60,388 | $ 85,233
Unrealized gains on securities | 2,580 | 4,576
Prepaid expenses and other | 2,603 | 3,230
Total deferred tax liabilities | 65,571 | 93,039
Deferred tax assets: |  |
Allowance for doubtful accounts | 344 | 378
Alternative minimum tax credit carryforward |  | 1,214
QAFMV tax credit carryforward | 864 | 864
New hire tax credit | 124 | 124
Compensated absences | 410 | 650
Self-insurance allowances | 149 | 748
Share-based compensation | 61 |
Share-based compensation |  | (54)
Goodwill |  | 9
Marketable equity securities | 750 | 1,244
Net operating loss carryover | 7,975 | 7,545
Non-competition agreement |  | 7
Other | 203 | 17
Total deferred tax assets | 10,880 | 12,746
Net deferred tax liability | $ 54,691 | $ 80,293

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