Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Balance Sheets
Allowance for doubtful accounts receivable, current	$ 3,000	$ 22,000
Inventory valuation reserves	$ 278,000	$ 279,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	47,598,476	37,703,476
Common stock, shares outstanding	32,680,984	37,703,476