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Note 11 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities:    
Property and equipment $ 60,388 $ 85,233
Unrealized gains on securities 2,580 4,576
Prepaid expenses and other 2,603 3,230
Total deferred tax liabilities 65,571 93,039
Deferred tax assets:    
Allowance for doubtful accounts 344 378
Alternative minimum tax credit carryforward 1,214
QAFMV tax credit carryforward 864 864
New hire tax credit 124 124
Compensated absences 410 650
Self-insurance allowances 149 748
Share-based compensation 61  
Share-based compensation   (54)
Goodwill 9
Marketable equity securities 750 1,244
Net operating loss carryover 7,975 7,545
Non-competition agreement 7
Other 203 17
Total deferred tax assets 10,880 12,746
Net deferred tax liability $ 54,691 $ 80,293