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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