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Property, Plant & Equipment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant & Equipment:      
Property, plant and equipment $ 137,996,000 $ 119,933,000  
Accumulated depreciation (63,893,000) (57,938,000)  
Property, plant and equipment — net 74,103,000 61,995,000  
Commitments for capital expenditures in progress recorded on balance sheet 1,102,000 1,682,000  
Capital Expenditures Incurred but Not yet Paid 464,000 557,000 $ 709,000
Capitalized interest expense 2,000 80,000  
Land and land improvements      
Property, Plant & Equipment:      
Property, plant and equipment 5,958,000 5,098,000  
Buildings      
Property, Plant & Equipment:      
Property, plant and equipment 41,417,000 37,143,000  
Machinery and equipment      
Property, Plant & Equipment:      
Property, plant and equipment 87,482,000 75,905,000  
Tools, dies and patterns      
Property, Plant & Equipment:      
Property, plant and equipment 808,000 808,000  
Additions in progress      
Property, Plant & Equipment:      
Property, plant and equipment $ 2,331,000 $ 979,000