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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
May 31, 2018
May 31, 2017
Net sales $ 5,564,185 $ 5,791,670
Cost of sales (3,809,785) (3,769,879)
GROSS PROFIT 1,754,400 2,021,791
OPERATING EXPENSES:    
Selling, general and administrative 1,837,787 1,845,789
Research and development 1,398,368 1,130,635
Total operating expenses 3,236,155 2,976,424
LOSS FROM OPERATIONS (1,481,755) (954,633)
OTHER INCOME (EXPENSE):    
Interest expense (37) (282)
Interest and dividend income 47,764 46,354
Total other income 47,727 46,072
LOSS BEFORE INCOME TAXES (1,434,028) (908,561)
INCOME TAX EXPENSE (31,800)
NET LOSS $ (1,465,828) $ (908,561)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.17) $ (0.11)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.17) $ (0.11)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES    
Basic (in Shares) 8,570,029 8,329,769
Diluted (in Shares) 8,570,029 8,329,769
NET LOSS $ (1,465,828) $ (908,561)
OTHER COMPREHENSIVE LOSS:    
Foreign currency translation (10,302) (2,248)
COMPREHENSIVE LOSS $ (1,476,130) $ (910,809)