Condensed Consolidated Statements of Shareholders' Equity(Unaudited) - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Mar. 31, 2020		$ 385,576	$ 19,729,043	$ (14,426,556)	$ 5,688,063
Balance, shares at Mar. 31, 2020		38,557,643
Net income				2,201,070	2,201,070
Ending balance, value at Sep. 30, 2020		$ 385,576	19,729,043	(12,225,486)	7,889,133
Balance, shares at Sep. 30, 2020		38,557,643
Beginning balance, value at Jun. 30, 2020		$ 385,576	19,729,043	(14,633,360)	5,481,259
Balance, shares at Jun. 30, 2020		38,557,643
Net income				2,407,874	2,407,874
Ending balance, value at Sep. 30, 2020		$ 385,576	19,729,043	(12,225,486)	7,889,133
Balance, shares at Sep. 30, 2020		38,557,643
Beginning balance, value at Mar. 31, 2021		$ 390,407	19,773,322	(12,254,191)	7,909,538
Balance, shares at Mar. 31, 2021		39,040,748
Net income				573,760	573,760
Issuance of stock		$ 165,000	4,785,000		4,950,000
Issuance of stock, shares		16,500,001
Issuance of pre-funded warrants			4,881,667		4,881,667
Payment of stock issuance expenses			(831,087)		(831,087)
Issuance of stock for stock issuance expenses		$ 5,714	(5,714)
Issuance of stock for stock issuance expenses, shares		571,428
Redemption and retirement of treasury shares		$ (196,231)	(4,111,459)	(2,854,762)	(7,162,452)
Redemption and retirement of treasury shares, shares		(19,623,155)
Issuance of common stock - directors		$ 172	4,828		5,000
Issuance of common stock - directors, shares		17,242
Issuance of common stock - non-employee		$ 500	16,500		17,000
Issuance of common stock - non-employee, shares		50,000
Employee compensation-stock option			12,727		12,727
Exercise of stock options		$ 200	4,600		4,800
Exercise of stock options, shares		20,000
Ending balance, value at Sep. 30, 2021		$ 365,762	24,530,384	(14,535,193)	10,360,953
Balance, shares at Sep. 30, 2021		36,576,264
Beginning balance, value at Jun. 30, 2021		$ 390,607	19,783,026	(12,372,804)	7,800,829
Balance, shares at Jun. 30, 2021		39,060,748
Net income				692,373	692,373
Issuance of stock		$ 165,000	4,785,000		4,950,000
Issuance of stock, shares		16,500,001
Issuance of pre-funded warrants			4,881,667		4,881,667
Payment of stock issuance expenses			(831,087)		(831,087)
Issuance of stock for stock issuance expenses		$ 5,714	(5,714)
Issuance of stock for stock issuance expenses, shares		571,428
Redemption and retirement of treasury shares		$ (196,231)	(4,111,459)	(2,854,762)	(7,162,452)
Redemption and retirement of treasury shares, shares		(19,623,155)
Issuance of common stock - directors		$ 172	4,828		5,000
Issuance of common stock - directors, shares		17,242
Issuance of common stock - non-employee		$ 500	16,500		17,000
Issuance of common stock - non-employee, shares		50,000
Employee compensation-stock option			7,623		7,623
Ending balance, value at Sep. 30, 2021		$ 365,762	$ 24,530,384	$ (14,535,193)	$ 10,360,953
Balance, shares at Sep. 30, 2021		36,576,264