CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Income Statement [Abstract]
Net sales	$ 3,628,638	$ 1,176,889	$ 6,144,970	$ 3,967,712
Cost of sales	(3,667,143)	(964,910)	(5,639,103)	(2,919,557)
Gross Profit	(38,505)	211,979	505,867	1,048,155
Operating Expenses:
Selling, general and administrative	1,278,393	653,585	3,697,804	1,714,543
Research and development	563,216	473,279	1,824,312	1,248,599
Total operating expense	1,841,609	1,126,864	5,522,116	2,963,142
Loss from operations	(1,880,114)	(914,885)	(5,016,249)	(1,914,987)
Other Income:
Dividend and interest income	37,943	53,964	54,017	62,515
Interest expense	(256)	(5)	(256)	(10)
Total other income	37,687	53,959	53,761	62,505
Loss before income taxes	(1,842,427)	(860,926)	(4,962,488)	(1,852,482)
Provision (benefit) for income taxes	(3,117)		11,401
Net loss	$ (1,839,310)	$ (860,926)	$ (4,973,889)	$ (1,852,482)
Basic net loss per common share (in Dollars per share)	$ (0.15)	$ (0.09)	$ (0.42)	$ (0.19)
Diluted net loss per common share (in Dollars per share)	$ (0.15)	$ (0.09)	$ (0.42)	$ (0.19)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	11,905,492	9,814,504	11,802,803	9,882,459
Diluted (in Shares)	11,905,492	9,814,504	11,802,803	9,882,459
Net loss	$ (1,839,310)	$ (860,926)	$ (4,973,889)	$ (1,852,482)
Other comprehensive loss, net of tax:
Foreign currency translation	(5,437)	(928)	(8,687)	(4,157)
Comprehensive loss	$ (1,844,747)	$ (861,854)	$ (4,982,576)	$ (1,856,639)