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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax asset    
Inventories $ 2,912 $ 3,299
State income taxes 328 53
Program accrual 7,529 7,088
Vacation pay accrual 756 685
Accrued bonuses 599 1,246
Bad debt expense 627 294
Stock compensation 2,755 1,723
NOL carryforward 1,141 580
Tax credits 824 779
Lease liability 3,308  
Other 209 266
Deferred tax asset 20,988 16,013
Deferred tax liability    
Plant and equipment, principally due to differences in depreciation and capitalized interest 35,545 30,269
Lease asset 3,265  
Prepaid expenses 1,323 1,107
Deferred tax liability 40,133 31,376
Total net deferred tax liability $ 19,145 $ 15,363