Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 58,000	$ 26,000
Inventories, reserve for obsolescence	39,000	50,000
Accumulated amortization	$ 291,337	$ 266,028
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	11,558,355
Common stock and additional paid-in capital, shares outstanding	11,582,641	11,558,355