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Critical Accounting Policies and Estimates (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Unusual or Infrequent Item, or Both [Line Items]
Allowance for doubtful accounts	$ 32,000	$ 90,000
Accounts receivable for chargebacks	255,000	222,000
Allowance for slow moving and obsolete inventory	451,000	362,000
Amount of revenue from contract liabilities related to open jobs outstanding	432,000
Estimated liability for compensation claims	890,000	916,000
Liability for post retirement healthcare benefits	9,114,000	9,080,000
Contract with Customer, Asset, after Allowance for Credit Loss, Current	443,000	17,000
Cash and cash equivalents	$ 1,326,000	$ 6,146,000

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