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The components of inventory consisted of the following: (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 2,030,782	$ 2,218,981
Work in progress	1,766,429	2,645,548
Finished goods (includes completed components)	3,831,938	4,251,982
Gross inventory	7,629,149	9,116,511
Inventory reserves	(2,649,221)	(2,730,223)
Inventory, net	$ 4,979,928	$ 6,386,288

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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