CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Net sales	$ 1,444,483	$ 1,410,110
Cost of sales	(929,912)	(833,148)
Gross profit	514,571	576,962
Operating Expenses:
Selling, general and administrative	452,014	418,348
Research and development	288,585	224,246
Total operating expenses	740,599	642,594
Loss from operations	(226,028)	(65,632)
Other Income:
Dividend and interest income	18,969	10,215
Total other income	18,969	10,215
Loss before income tax	(207,059)	(55,417)
Provision for income taxes
Net loss	$ (207,059)	$ (55,417)
Basic net loss per common share (in Dollars per share)	$ (0.02)	$ (0.01)
Diluted net loss per common share (in Dollars per share)	$ (0.02)	$ (0.01)
Weighted average number of common and common equivalent shares:
Basic (in Shares)	8,511,260	8,169,673
Diluted (in Shares)	8,511,260	8,169,673
Net loss	$ (207,059)	$ (55,417)
Other comprehensive gain (loss), net of tax:
Foreign currency translation	(824)	26
Comprehensive loss	$ (207,883)	$ (55,391)