2 - Balance Sheet Details: Schedule of Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2021

Tables/Schedules

Schedule of Valuation and Qualifying Accounts

	December 31, 2021	December 31, 2020
Allowance for Doubtful Accounts:
Balance at beginning of year	$ 170,000	$ 140,000
Charges to statement of income	0	35,774
Write-offs	0	(5,774)
Balance at end of year	$ 170,000	$ 170,000

	December 31, 2021	December 31, 2020
Inventory Valuation Reserves:
Balance at beginning of year	$   600,000	$   457,000
Charges to statement of income	41,308	155,058
Write-offs	(29,308)	(12,058)
Balance at end of year	$   612,000	$   600,000