Inventory (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Inventory
Raw materials	$ 448,000	$ 462,000
Work in process	94,000	109,000
Finished goods	137,000	150,000
Allowance for slow moving and obsolete inventory	(260,000)	(278,000)
Inventory, net	$ 419,000	$ 443,000

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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

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