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Note 11 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 85,233,000 | $ 76,362,000
Unrealized gains on securities | 4,576,000 | 3,250,000
Prepaid expenses and other | 3,230,000 | 3,056,000
Total deferred tax liabilities | 93,039,000 | 82,668,000
Deferred tax assets: |  |
Allowance for doubtful accounts | 378,000 | 208,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 1,214,000 | 1,378,000
QAFMV tax credit carryforward | 864,000 | 864,000
New hire tax credit | 124,000 | 124,000
Compensated absences | 650,000 | 625,000
Self-insurance allowances | 748,000 | 2,340,000
Share-based compensation | (54,000) |
Share-based compensation |  | 230,000
Goodwill | 9,000 | 19,000
Marketable equity securities | 1,244,000 | 1,283,000
Net operating loss carryover | 7,545,000 | 3,258,000
Non-competition agreement | 7,000 | 15,000
Other | 17,000 | 15,000
Total deferred tax assets | 12,746,000 | 10,359,000
Net deferred tax liability | $ 80,293,000 | $ 72,309,000

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