Inventory (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Inventory
Raw materials	$ 536,000	$ 534,000
Work in process	122,000	127,000
Finished goods	138,000	154,000
Allowance for slow moving and obsolete inventory	(321,000)	(279,000)
Inventory, net	$ 475,000	$ 536,000

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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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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 raw materials 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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