CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	May 31, 2020	May 31, 2019
Income Statement [Abstract]
Net sales	$ 6,692,711	$ 5,200,682
Cost of sales	(4,910,935)	(3,908,668)
GROSS PROFIT	1,781,776	1,292,014
OPERATING EXPENSES:
Selling, general and administrative	2,274,415	2,025,706
Research and development	1,910,209	1,679,098
Total operating expenses	4,184,624	3,704,804
LOSS FROM OPERATIONS	(2,402,848)	(2,412,790)
OTHER INCOME (EXPENSE):
Interest expense	(9)	(47)
Interest and dividend income	71,193	44,014
Total other income	71,184	43,967
LOSS BEFORE INCOME TAXES	(2,331,664)	(2,368,823)
INCOME TAX EXPENSE	(7,390)	(24,237)
NET LOSS	$ (2,339,054)	$ (2,393,060)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.23)	$ (0.26)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.23)	$ (0.26)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES
Basic (in Shares)	10,166,296	9,212,557
Diluted (in Shares)	10,166,296	9,212,557
NET LOSS	$ (2,339,054)	$ (2,393,060)
OTHER COMPREHENSIVE LOSS:
Foreign currency translation	(3,310)	(10,395)
COMPREHENSIVE LOSS	$ (2,342,364)	$ (2,403,455)