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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Current: |  |
Inventories | $ 5,949 | $ 5,558
State income taxes | (215) | (633)
Vacation pay accrual | 796 | 776
Accrued bonuses | 543 | 95
Bad debt | 45 | 45
Prepaid expenses | (1,157) | (1,314)
Stock compensation | 1,781 | 2,446
Other | 359 | 1,758
Net deferred tax asset | 8,101 | 8,731
Non-Current: |  |
Plant and equipment, principally due to differences in depreciation and capitalized interest | (30,038) | (28,365)
NOL Carryforward | 658 | 361
Tax credit | 524 | 319
Other | 1,300 | (474)
Net deferred tax liability | (27,556) | (28,159)
Total net deferred tax liability | $ (19,455) | $ (19,428)

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