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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred Tax Assets And Liabilities [Line Items]    
Inventories $ 3,490 $ 2,681
State income taxes (431) (413)
Vacation pay accrual 354 289
Accrued bonuses 2,289 1,445
Bad debt 192 78
Prepaid expenses (1,490) (1,432)
Other 473 769
Net deferred tax asset 4,877 3,417
Plant and equipment, principally due to differences in depreciation and capitalized interest (21,993) (20,653)
NOL carryforward   244
Tax credit 73  
Fair value adjustment 460 564
Other 2,297 1,256
Net deferred tax liability (19,163) (18,589)
Total net deferred tax liability $ (14,286) $ (15,172)