CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Net sales	$ 1,272,870	$ 1,444,483
Cost of sales	(935,647)	(929,912)
Gross profit	337,223	514,571
Operating Expenses:
Selling, general and administrative	400,228	452,014
Research and development	391,781	288,585
Total operating expenses	792,009	740,599
Loss from operations	(454,786)	(226,028)
Other Income (expense):
Dividend and interest income	3,093	18,969
Interest expense	(47)
Total other income	3,046	18,969
Loss before income tax	(451,740)	(207,059)
Provision for income taxes
Net loss	$ (451,740)	$ (207,059)
Basic net loss per common share (in Dollars per share)	$ (0.05)	$ (0.02)
Diluted net loss per common share (in Dollars per share)	$ (0.05)	$ (0.02)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	8,930,251	8,511,260
Diluted (in Shares)	8,930,251	8,511,260
Net loss	$ (451,740)	$ (207,059)
Other comprehensive gain (loss), net of tax:
Foreign currency translation	(1,326)	(824)
Comprehensive loss	$ (453,066)	$ (207,883)