Consolidated Statements of Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Mar. 31, 2020	$ 12,853	$ 20,101,766	$ (14,426,556)	$ 5,688,063
Balance, shares at Mar. 31, 2020	1,285,255
Net income			2,172,365	2,172,365
Employee compensation-stock option		10,210		10,210
Exercise of stock options	$ 147	26,253		26,400
Exercise of stock options, shares	14,667
Issuance of common stock - directors	$ 14	12,486		12,500
Issuance of common stock - directors, shares	1,437
Ending balance, value at Mar. 31, 2021	$ 13,014	20,150,715	(12,254,191)	7,909,538
Balance, shares at Mar. 31, 2021	1,301,358
Net income			230,471	230,471
Employee compensation-stock option		22,287		22,287
Exercise of stock options	$ 27	13,973		14,000
Exercise of stock options, shares	2,667
Issuance of common stock - directors	$ 6	4,994		5,000
Issuance of common stock - directors, shares	575
Issuance of stock	$ 5,500	4,944,500		4,950,000
Issuance of stock, shares	550,000
Issuance of pre-funded warrants		4,881,667		4,881,667
Payment of stock issuance expenses		(831,088)		(831,088)
Issuance of stock for stock issuance expenses	$ 190	(190)
Issuance of stock for stock issuance expenses, shares	19,048
Redemption and retirement of treasury shares	$ (6,542)	(4,301,147)	(2,854,762)	(7,162,451)
Redemption and retirement of treasury shares, shares	(654,105)
Issuance of common stock - non-employee	$ 17	16,983		17,000
Issuance of common stock - non-employee, shares	1,667
Collection of subscription receivable
Ending balance, value at Mar. 31, 2022	$ 12,212	$ 24,902,694	$ (14,878,482)	$ 10,036,424
Balance, shares at Mar. 31, 2022	1,221,209