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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax asset    
Inventories $ 5,359 $ 5,949
State income taxes 213 (215)
Program accrual 12,318 12,598
Vacation pay accrual 818 796
Accrued bonuses 2,072 543
Bad debt 6 45
Stock compensation 1,614 1,781
Tax credit 14 524
Other 2,707 1,659
Deferred tax asset 25,472 24,338
Deferred tax liability    
NOL carryforward 351 658
Plant and equipment, principally due to differences in depreciation and capitalized interest 30,636 30,038
Prepaid expenses 1,542 1,157
Deferred tax liability 32,178 31,195
Total net deferred tax liability $ 6,706 $ 6,857