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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