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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax asset    
Inventories $ 3,213 $ 5,359
State income taxes 330 213
Program accrual 7,381 12,318
Vacation pay accrual 600 818
Accrued bonuses 1,073 2,072
Bad debt expense 12 6
Stock compensation 822 1,614
Tax credit 778 14
Other 381 2,707
Deferred tax asset 14,644 25,472
Deferred tax liability    
NOL carryforward 54 351
Plant and equipment, principally due to differences in depreciation and capitalized interest 29,986 30,636
Prepaid expenses 942 1,542
Deferred tax liability 30,928 32,178
Total net deferred tax liability $ 16,284 $ 6,706