CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020
Income Statement [Abstract]
Net sales	$ 7,199,027	$ 6,692,711
Cost of sales	(6,832,742)	(4,954,484)
Gross Profit	366,285	1,738,227
Operating Expenses:
Selling, general and administrative	5,394,525	2,546,622
Research and development	2,471,453	1,932,570
Total operating expense	7,865,978	4,479,192
Loss from operations	(7,499,693)	(2,740,965)
Other Income:
Dividend and interest income	66,863	71,193
Interest expense	(367)	(9)
Total other income	66,496	71,184
Loss before income taxes	(7,433,197)	(2,669,781)
Provision for income taxes	(13,057)	(7,390)
Net loss	$ (7,446,254)	$ (2,677,171)
Basic net loss per common share (in Dollars per share)	$ (0.62)	$ (0.26)
Diluted net loss per common share (in Dollars per share)	$ (0.62)	$ (0.26)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	11,928,941	10,166,296
Diluted (in Shares)	11,928,941	10,166,296
Net loss	$ (7,446,254)	$ (2,677,171)
Other comprehensive loss, net of tax:
Foreign currency translation	(8,115)	(3,310)
Comprehensive loss	$ (7,454,369)	$ (2,680,481)