Schedule of Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Allowance, Credit Loss
Balance at beginning of year	$ 170,000	$ 170,000
Charges to statement of income	(1,660)	0
Write-offs	(8,340)	0
Balance at end of year	160,000	170,000
SEC Schedule, 12-09, Reserve, Inventory
Balance at beginning of year	612,000	600,000
Charges to statement of income	17,070	41,308
Write-offs	(8,070)	(29,308)
Balance at end of year	$ 621,000	$ 612,000