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Property, Plant & Equipment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant & Equipment:      
Property, plant and equipment $ 164,145,000 $ 144,849,000  
Accumulated depreciation (83,488,000) (76,218,000)  
Property, plant and equipment — net 80,657,000 68,631,000  
Commitments for capital expenditures in progress recorded on balance sheet 3,461,000 1,071,000  
Capital Expenditures Incurred but Not yet Paid 871,000 278,000 $ 316,000
Land and land improvements      
Property, Plant & Equipment:      
Property, plant and equipment 6,009,000 6,009,000  
Buildings      
Property, Plant & Equipment:      
Property, plant and equipment 43,042,000 42,769,000  
Machinery and equipment      
Property, Plant & Equipment:      
Property, plant and equipment 108,661,000 92,218,000  
Tools, dies and patterns      
Property, Plant & Equipment:      
Property, plant and equipment 1,419,000 808,000  
Asset under Construction [Member]      
Property, Plant & Equipment:      
Property, plant and equipment $ 5,014,000 $ 3,045,000