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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax asset    
Inventories $ 3,299 $ 3,213
State income taxes 53 330
Program accrual 7,088 7,381
Vacation pay accrual 685 600
Accrued bonuses 1,246 1,073
Bad debt expense 294 12
Stock compensation 1,723 822
NOL carryforward 580 54
Tax credits 779 778
Other 266 381
Deferred tax asset 16,013 14,644
Deferred tax liability    
Plant and equipment, principally due to differences in depreciation and capitalized interest 30,269 29,986
Prepaid expenses 1,107 942
Deferred tax liability 31,376 30,928
Total net deferred tax liability $ 15,363 $ 16,284