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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current deferred tax assets:    
Costs and estimated earnings in excess of billings on uncompleted contracts, net $ 1,323 $ 1,459
Accrued employee benefits 1,612 3,110
Inventories 1,393 1,337
Trade receivable, net 650 625
Net operating loss carryforwards 364 622
Accrued professional fees   77
Other 693 176
Total 6,035 7,406
Valuation allowance (146) (350)
Deferred income taxes 5,177 6,391
Current deferred tax liabilities:    
Prepaid expenses (712) (665)
Current deferred tax assets, net 5,177 6,391
Noncurrent deferred tax assets:    
Net operating loss carryforwards 549 499
Tax credit carryforwards 64 102
Accrued employee benefits 3,673 2,708
Other assets 4,527 3,617
Other 17 219
Total 8,830 7,145
Valuation allowance (794) (576)
Deferred Tax Assets, Net of Valuation Allowance Noncurrent 8,036 6,569
Noncurrent deferred tax liabilities:    
Property and equipment (23,290) (27,157)
Noncurrent deferred tax liabilities, net (15,254) (20,588)
Net deferred tax liabilities $ (10,077) $ (14,197)