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Note 11 - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax liabilities: |  |
Property and equipment | $ 76,362,000 | $ 64,341,000
Unrealized gains on securities | 3,250,000 | 3,918,000
Prepaid expenses and other | 3,056,000 | 3,837,000
Total deferred tax liabilities | 6,306,000 | 7,755,000
Total deferred tax liabilities | 76,362,000 | 64,341,000
us-gaap_DeferredTaxAssetsGrossAbstract |  |
Allowance for doubtful accounts | 208,000 | 612,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 1,378,000 | 1,206,000
QAFMV tax credit carryforward | 864,000 | 864,000
New hire tax credit | 124,000 | 124,000
Compensated absences | 625,000 | 564,000
Self-insurance allowances | 2,340,000 | 2,592,000
Share-based compensation | 230,000 | 579,000
Goodwill | 19,000 | 28,000
Marketable equity securities | 1,283,000 | 686,000
Net operating loss carryover | $ 3,258,000 | 4,392,000
Capital loss carryover |  | 339,000
Non-competition agreement | $ 15,000 | 23,000
Other | 15,000 | 11,000
Total deferred tax assets | 4,471,000 | 4,804,000
Total deferred tax assets | 5,888,000 | 7,216,000
Net deferred tax liability | 1,835,000 | 2,951,000
Net deferred tax liability | $ 70,474,000 | $ 57,125,000

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