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Note 11 - Federal and State Income Taxes (Details) - Significant Components of Deferred Tax Liabilities and Assets (USD $)
Dec. 31, 2013
Dec. 31, 2012
Deferred tax liabilities:    
Property and equipment $ 73,099,000 $ 69,667,000
Unrealized gains on securities 3,769,000 2,591,000
Prepaid expenses and other 2,498,000 4,171,000
Total deferred tax liabilities 6,267,000 6,762,000
Total deferred tax liabilities 73,099,000 69,667,000
Deferred tax assets:    
Allowance for doubtful accounts 561,000 439,000
Alternative minimum tax credit carryforward 318,000 193,000
QAFMV tax credit carryforward 864,000 864,000
New hire tax credit 124,000 124,000
Compensated absences 594,000 616,000
Self-insurance allowances 1,027,000 787,000
Share-based compensation 702,000 582,000
Goodwill 37,000 364,000
Marketable equity securities 767,000 723,000
Net operating loss carryover 21,255,000 23,115,000
Capital loss carryover 667,000 915,000
Non-competition agreement 30,000 47,000
Other   10,000
Other 5,000 10,000
Total deferred tax assets 3,616,000 3,490,000
Total deferred tax assets 23,335,000 25,299,000
Net deferred tax liability 2,651,000 3,272,000
Net deferred tax liability $ 49,764,000 $ 44,368,000