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	(6,702,046)	(4,910,935)
Gross Profit	496,981	1,781,776
Operating Expenses:
Selling, general and administrative	4,608,950	2,274,415
Research and development	2,410,506	1,910,209
Total operating expense	7,019,456	4,184,624
Loss from operations	(6,522,475)	(2,402,848)
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	(6,455,979)	(2,331,664)
Provision for income taxes	(13,057)	(7,390)
Net loss	$ (6,469,036)	$ (2,339,054)
Basic net loss per common share (in Dollars per share)	$ (0.54)	$ (0.23)
Diluted net loss per common share (in Dollars per share)	$ (0.54)	$ (0.23)
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	$ (6,469,036)	$ (2,339,054)
Other comprehensive loss, net of tax:
Foreign currency translation	(8,115)	(3,310)
Comprehensive loss	$ (6,477,151)	$ (2,342,364)