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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal - US $ 4,466,000 $ 1,875,000 $ 2,540,000
Federal - Foreign 405,000 453,000 171,000
State and local 18,000 42,000 44,000
Current income tax expense (benefit) 4,889,000 2,370,000 2,755,000
Deferred:      
Federal 1,143,000 2,423,000 496,000
Deferred Foreign Income Tax Expense (Benefit) 27,000 (29,000) (240,000)
State and local 59,000 127,000 23,000
Deferred income tax expense (benefit) 1,229,000 2,521,000 279,000
Total income taxes 6,118,000 4,891,000 3,034,000
Reconciliation of income tax provision:      
Provision at federal statutory rate - US 6,177,000 4,938,000 3,366,000
Effect of Mexican tax law change 0 0 (240,000)
Effect of foreign taxes (84,000) (115,000) (192,000)
Disqualified stock options (5,000) (84,000) 0
State and local tax expense, net of federal benefit 76,000 170,000 44,000
Other $ (46,000) $ (18,000) 56,000
Federal Statutory Income Tax Rate 34.00% 34.00%  
Components of deferred tax assets (liabilities):      
Accrued liabilities $ 820,000 $ 808,000  
Accounts receivable 202,000 484,000  
Inventory 698,000 680,000  
Other, net (122,000) (104,000)  
Total current asset 1,598,000 1,868,000  
Property, plant, and equipment (4,844,000) (4,273,000)  
Post retirement benefits 3,350,000 3,419,000  
Other, net (758,000) (511,000)  
Deferred Tax Liabilities, Net, Noncurrent (2,252,000) (1,365,000)  
Deferred tax assets (654,000) 503,000  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 211,000 $ 395,000 $ 409,000
Unrecorded deferred tax liabilities, undistributed foreign earnings 7,319,000    
Unrecognized Tax Benefits $ 0