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Property and Equipment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Total Property and Equipment	$ 33,333,000	$ 33,139,000
Less: Accumulated Depreciation	(26,203,000)	(25,561,000)
Property and Equipment, net	7,130,000	7,578,000
Land [Member]
Total Property and Equipment	300,000	300,000
Buildings and Improvements [Member]
Total Property and Equipment	$ 1,659,000	1,650,000
Property and Equipment, Useful Life	31 years 6 months
Machinery and Equipment [Member]
Total Property and Equipment	$ 12,264,000	12,251,000
Machinery and Equipment [Member] | Minimum [Member]
Property and Equipment, Useful Life	5 years
Machinery and Equipment [Member] | Maximum [Member]
Property and Equipment, Useful Life	8 years
Finance Lease Machinery and Equipment [Member]
Total Property and Equipment	$ 6,495,000	6,495,000
Tools and Instruments [Member]
Total Property and Equipment	$ 11,219,000	11,021,000
Tools and Instruments [Member] | Minimum [Member]
Property and Equipment, Useful Life	1 year 6 months
Tools and Instruments [Member] | Maximum [Member]
Property and Equipment, Useful Life	7 years
Automotive Equipment [Member]
Total Property and Equipment	$ 148,000	177,000
Property and Equipment, Useful Life	5 years
Furniture and Fixtures [Member]
Total Property and Equipment	$ 290,000	290,000
Furniture and Fixtures [Member] | Minimum [Member]
Property and Equipment, Useful Life	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property and Equipment, Useful Life	8 years
Leasehold Improvements [Member]
Total Property and Equipment	$ 530,000	530,000
Property and Equipment, Useful Life, description	Term of Lease
Computers and Software [Member]
Total Property and Equipment	$ 428,000	$ 425,000
Computers and Software [Member] | Minimum [Member]
Property and Equipment, Useful Life	4 years
Computers and Software [Member] | Maximum [Member]
Property and Equipment, Useful Life	6 years
Finance Lease Machinery and Equipment [Member] | Minimum [Member]
Property and Equipment, Useful Life	5 years
Finance Lease Machinery and Equipment [Member] | Maximum [Member]
Property and Equipment, Useful Life	8 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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