CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,261,787	$ 1,143,806
Cost of sales	(1,350,757)	(1,025,717)
Gross (Loss) Profit	(88,970)	118,089
Operating Expenses:
Selling, general and administrative	1,011,535	1,305,944
Research and development	439,864	711,505
Total operating expense	1,451,399	2,017,449
Loss from operations	(1,540,369)	(1,899,360)
Other Income:
Dividend and interest income	6,805	8,091
Loss before income taxes	(1,533,564)	(1,891,269)
Provision for income taxes	(9,017)	(1,125)
Net loss	$ (1,542,581)	$ (1,892,394)
Basic net loss per common share (in Dollars per share)	$ (0.12)	$ (0.16)
Diluted net loss per common share (in Dollars per share)	$ (0.12)	$ (0.16)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	12,426,784	11,748,377
Diluted (in Shares)	12,426,784	11,748,377
Net loss	$ (1,542,581)	$ (1,892,394)
Other comprehensive loss, net of tax:
Foreign currency translation	(5,613)	(1,721)
Comprehensive loss	$ (1,548,194)	$ (1,894,115)