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Note 13 - Federal and State Income Taxes - Significant Components of Deferred Tax Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax liabilities:    
Property and equipment $ 78,502 $ 60,388
Unrealized gains on securities 2,580 2,580
Prepaid expenses and other 2,667 2,603
Total deferred tax liabilities 83,749 65,571
Deferred tax assets:    
Allowance for doubtful accounts 572 344
QAFMV tax credit carryforward 864 864
New hire tax credit 124 124
Compensated absences 460 410
Self-insurance allowances 188 149
Share-based compensation 61
Marketable equity securities 2,200 750
Net operating loss carryover 17,241 7,975
Other 203 203
Total deferred tax assets 21,852 10,880
Net deferred tax liability $ 61,897 $ 54,691