Critical Accounting Policies and Estimates (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]
Allowance for doubtful accounts	$ 58,000		$ 41,000
Accounts receivable for chargebacks	440,000		179,000
Allowance for slow moving and obsolete inventory	252,000		546,000
Amount of revenue from contract liabilities related to open jobs outstanding	3,107,000
Impairment of long-lived assets	0	$ 0
Estimated liability for compensation claims	866,000		933,000
Liability for post retirement healthcare benefits	9,033,000		9,109,000
Contract with Customer, Asset, after Allowance for Credit Loss, Current	46,000		$ 554,000
Contract-based intangible assets
Unusual or Infrequent Item, or Both [Line Items]
Impairment on contract assets	$ 0