CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Net sales	$ 5,791,670	$ 5,139,816
Cost of sales	(3,769,879)	(3,615,774)
GROSS PROFIT	2,021,791	1,524,042
OPERATING EXPENSES:
Selling, general and administrative	1,845,789	1,570,661
Research and development	1,130,635	780,333
Total operating expenses	2,976,424	2,350,994
LOSS FROM OPERATIONS	(954,633)	(826,952)
OTHER INCOME (EXPENSE):
Interest expense	(282)	(167)
Interest and dividend income	46,354	24,123
Other income		7,009
Total other income	46,072	30,965
LOSS BEFORE INCOME TAXES	(908,561)	(795,987)
INCOME TAX (EXPENSE) BENEFIT		(703,800)
NET LOSS	$ (908,561)	$ (1,499,787)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.11)	$ (0.20)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share)	$ (0.11)	$ (0.20)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES
Basic (in Shares)	8,329,769	7,626,078
Diluted (in Shares)	8,329,769	7,626,078
NET LOSS	$ (908,561)	$ (1,499,787)
OTHER COMPREHENSIVE LOSS:
Foreign currency translation	(2,248)	(1,322)
COMPREHENSIVE LOSS	$ (910,809)	$ (1,501,109)