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Property and Equipment (Details) - Schedule of property and equipment - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 37,644,000	$ 37,917,000
Less: Accumulated Depreciation	(28,063,000)	(28,776,000)
Property and Equipment, net	9,581,000	9,141,000
Land [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	300,000	300,000
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 1,683,000	1,720,000
Useful Life, Property and Equipment	31.50
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 21,738,000	21,838,000
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	5
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	8
Finance Lease Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 78,000	78,000
Finance Lease Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	5
Finance Lease Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	8
Tools and Instruments [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 12,116,000	12,246,000
Tools and Instruments [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	1.50
Tools and Instruments [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	7
Automotive Equipment [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 148,000	148,000
Useful Life, Property and Equipment	5
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 290,000	290,000
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	5
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	8
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 855,000	861,000
Useful Life, Property and Equipment	Term of Lease
Computers and Software [Member]
Property, Plant and Equipment [Line Items]
Total Property and Equipment	$ 436,000	$ 436,000
Computers and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	4
Computers and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful Life, Property and Equipment	6

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