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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal - US $ 3,633 $ 4,793  
Federal - Foreign 227 242  
State and local 96 117  
Current income tax expense (benefit) 3,956 5,152  
Deferred:      
Federal 10 566  
State and local 0 4  
Deferred income tax expense (benefit) 10 570  
Total income taxes 3,966 5,722  
Reconciliation of income tax provision:      
Provision at federal statutory rate - US 4,133 5,525  
Effect of Mexican income tax penalties, interest and surcharges 0 89  
Effect of foreign taxes (169) 84  
Other 2 24  
Tax benefits from share-based compensation 163 322  
Deferred tax assets 3,164 2,888 2,888
Effective income tax rate 34.00% 34.00%  
Components of deferred tax assets (liabilities):      
Accrued liabilities 661   687
Accounts receivable 446   545
Inventory 678   704
Other, net (87)   (93)
Total current asset 1,698 1,843 1,843
Property, plant, and equipment (2,080)   (2,197)
Post retirement benefits 3,662   3,459
Interest rate swap 72   112
Other, net (188)   (329)
Total non-current asset 1,466 1,045 1,045
Unrecorded deferred tax liabilities, undistributed foreign earnings $ 4,174