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Property, Plant & Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant & Equipment:
Property, plant and equipment	$ 170,881,000	$ 164,145,000
Accumulated depreciation	(91,675,000)	(83,488,000)
Property, plant and equipment — net	79,206,000	80,657,000
Commitments for capital expenditures in progress recorded on balance sheet	336,000	3,461,000
Capital Expenditures Incurred but Not yet Paid	158,000	871,000	$ 278,000
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	43,375,000	43,042,000
Machinery and equipment
Property, Plant & Equipment:
Property, plant and equipment	118,366,000	108,661,000
Tools, dies and patterns
Property, Plant & Equipment:
Property, plant and equipment	1,516,000	1,419,000
Asset under Construction [Member]
Property, Plant & Equipment:
Property, plant and equipment	$ 1,615,000	$ 5,014,000

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