CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 5,272,223	$ 6,457,295	$ 9,940,221	$ 9,398,063
Cost of goods sold	3,696,045	4,353,267	7,105,718	6,216,892
GROSS PROFIT	1,576,178	2,104,028	2,834,503	3,181,171
Selling, general and administrative expense	1,357,103	1,264,209	2,490,242	2,250,878
Research and development expense	97,070	91,750	198,126	225,668
Operating income	122,005	748,069	146,135	704,625
Other expense:
Interest expense	(14,309)	(22,224)	(23,798)	(57,762)
NET INCOME	$ 107,696	$ 725,845	$ 122,337	$ 646,863
Earnings per share:
Basic per share	$ 0.05	$ 0.31	$ 0.05	$ 0.28
Diluted per share	$ 0.05	$ 0.31	$ 0.05	$ 0.28
Shares used in computing earnings per share:
Weighted average basic shares outstanding	2,312,887	2,312,887	2,312,887	2,312,887
Weighted average diluted shares outstanding	2,312,887	2,312,887	2,312,887	2,312,887