Business Description and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Y customer	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts	$ 131,000	$ 188,000
Warranty reserve	511,000	382,000
Inventory reserve	$ 1,742,000	1,720,000
Warranty period	27 months
Income taxes paid, net of refund	$ 345,000	40,000
Interest paid	$ 187,000	180,000
Impairment of long-lived assets		$ 0	$ 0
Concentration risk, benchmark description	No other customers of the ATG or CPG represented more than 10% of the Company’s consolidated revenues in either of these years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of years of customer requirements | Y	2
Number of year's supply | Y	1
Customer Concentration Risk | Advanced Technology Products | Sales Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of customers | customer	2
Customer Concentration Risk | Advanced Technology Products | Sales Revenue | Two Customers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, benchmark description	more than 10%
Customer Concentration Risk | Advanced Technology Products | Sales Revenue | Customer A
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration Risk, Percentage	52.60%	49.00%
Customer Concentration Risk | Advanced Technology Products | Sales Revenue | Customer B
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration Risk, Percentage	52.60%	49.00%