Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid in Capital [Member]	Subscriptions Receivable [Member]	Accumulated Deficit [Member]	Total
Balance at Mar. 31, 2019		$ 384,648	$ 19,687,263	$ (2,200)	$ (11,569,556)	$ 8,500,155
Balance, shares at Mar. 31, 2019		38,464,753
Net income (loss)					(245,359)	(245,359)
Employee compensation-stock option			10,004			10,004
Collection of subscription receivable				2,200		2,200
Exercise of stock options		$ 600	9,600			10,200
Exercise of stock options, shares		60,000
Issuance of common stock - directors		$ 329	12,171			12,500
Issuance of common stock - directors, shares		32,890
Balance at Sep. 30, 2019		$ 385,577	19,719,038		(11,814,915)	8,289,700
Balance, shares at Sep. 30, 2019		38,557,643
Balance at Jun. 30, 2019		$ 384,977	19,704,436		(12,439,137)	7,650,276
Balance, shares at Jun. 30, 2019		38,497,643
Net income (loss)					624,222	624,222
Employee compensation-stock option			5,002			5,002
Exercise of stock options		$ 600	9,600			10,200
Exercise of stock options, shares		60,000
Balance at Sep. 30, 2019		$ 385,577	19,719,038		(11,814,915)	8,289,700
Balance, shares at Sep. 30, 2019		38,557,643
Balance 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 (loss)					2,201,070	2,201,070
Balance at Sep. 30, 2020		$ 385,576	19,729,043		(12,225,486)	7,889,133
Balance, shares at Sep. 30, 2020		38,557,643
Balance 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 (loss)					2,407,874	2,407,874
Balance at Sep. 30, 2020		$ 385,576	$ 19,729,043		$ (12,225,486)	$ 7,889,133
Balance, shares at Sep. 30, 2020		38,557,643