CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Income Statement [Abstract]
Net sales	$ 7,660,501	$ 3,628,638	$ 13,569,188	$ 6,144,970
Cost of sales	(5,987,277)	(3,702,069)	(11,213,175)	(5,791,593)
Gross profit (loss)	1,673,224	(73,431)	2,356,013	353,377
Operating expenses:
Selling, general and administrative	1,323,725	1,527,947	3,618,258	4,238,737
Research and development	456,998	563,967	1,515,384	1,892,033
Total operating expense	1,780,723	2,091,914	5,133,642	6,130,770
Loss from operations	(107,499)	(2,165,345)	(2,777,629)	(5,777,393)
Other income:
Dividend and interest income	6,019	37,687	19,740	53,761
Loss before income taxes	(101,480)	(2,127,658)	(2,757,889)	(5,723,632)
(Provision) benefit for income taxes	(2,688)	3,117	(14,134)	(11,401)
Net loss	$ (104,168)	$ (2,124,541)	$ (2,772,023)	$ (5,735,033)
Basic net loss per common share (in Dollars per share)	$ (0.01)	$ (0.18)	$ (0.22)	$ (0.49)
Diluted net loss per common share (in Dollars per share)	$ (0.01)	$ (0.18)	$ (0.22)	$ (0.49)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	12,820,481	11,905,492	12,611,760	11,802,803
Diluted (in Shares)	12,820,481	11,905,492	12,611,760	11,802,803
Net loss	$ (104,168)	$ (2,124,541)	$ (2,772,023)	$ (5,735,033)
Other comprehensive loss, net of tax:
Foreign currency translation	(2,538)	(5,437)	(12,901)	(8,687)
Comprehensive loss	$ (106,706)	$ (2,129,978)	$ (2,784,924)	$ (5,743,720)