CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Income Statement [Abstract]
Net sales	$ 4,646,900	$ 1,372,526	$ 5,908,687	$ 2,516,332
Cost of sales	(3,875,141)	(1,063,807)	(5,225,898)	(2,089,524)
Gross profit	771,759	308,719	682,789	426,808
Operating expenses:
Selling, general and administrative	1,282,998	1,404,846	2,294,533	2,710,790
Research and development	618,522	616,561	1,058,386	1,328,066
Total operating expense	1,901,520	2,021,407	3,352,919	4,038,856
Loss from operations	(1,129,761)	(1,712,688)	(2,670,130)	(3,612,048)
Other income:
Dividend and interest income	6,916	7,983	13,721	16,074
Loss before income taxes	(1,122,845)	(1,704,705)	(2,656,409)	(3,595,974)
Provision for income taxes	(2,429)	(13,393)	(11,446)	(14,518)
Net loss	$ (1,125,274)	$ (1,718,098)	$ (2,667,855)	$ (3,610,492)
Basic net loss per common share (in Dollars per share)	$ (0.09)	$ (0.15)	$ (0.21)	$ (0.31)
Diluted net loss per common share (in Dollars per share)	$ (0.09)	$ (0.15)	$ (0.21)	$ (0.31)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	12,592,341	11,756,265	12,509,110	11,752,299
Diluted (in Shares)	12,592,341	11,756,265	12,509,110	11,752,299
Net loss	$ (1,125,274)	$ (1,718,098)	$ (2,667,855)	$ (3,610,492)
Other comprehensive loss, net of tax:
Foreign currency translation	(4,750)	(1,530)	(10,363)	(3,250)
Comprehensive loss	$ (1,130,024)	$ (1,719,628)	$ (2,678,218)	$ (3,613,742)