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, 2018		$ 382,820	$ 19,624,063		$ (12,201,103)	$ 7,805,780
Balance, shares at Mar. 31, 2018		38,282,028
Net Income					183,278	183,278
Employee compensation-stock option			20,830			20,830
Exercise of stock options		$ 800	5,600			6,400
Exercise of stock options, shares		80,000
Director fees		$ 227	12,273			12,500
Director fees, shares		22,725
Balance at Sep. 30, 2018		$ 383,847	19,662,766		(12,017,825)	8,028,788
Balance, shares at Sep. 30, 2018		38,384,753
Balance at Jun. 30, 2018		$ 382,820	19,635,341		(13,235,254)	6,782,907
Balance, shares at Jun. 30, 2018		38,282,028
Net Income					1,217,429	1,217,429
Employee compensation-stock option			9,552			9,552
Exercise of stock options		$ 800	5,600			6,400
Exercise of stock options, shares		80,000
Issuance of common stock - directors		$ 227	12,273			12,500
Issuance of common stock - directors, shares		22,725
Balance at Sep. 30, 2018		$ 383,847	19,662,766		(12,017,825)	8,028,788
Balance, shares at Sep. 30, 2018		38,384,753
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					(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					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