Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 35,000	$ 58,000
Inventories, reserve for obsolescence	70,000	39,000
Accumulated amortization	$ 317,821	$ 291,337
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock and additional paid-in capital, shares authorized	100,000,000	100,000,000
Common stock and additional paid-in capital, shares issued	11,582,641	11,582,641
Common stock and additional paid-in capital, shares outstanding	11,582,641	11,582,641