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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
May 31, 2019
May 31, 2018
Net sales $ 5,200,682 $ 5,564,185
Cost of sales (3,908,668) (3,809,785)
GROSS PROFIT 1,292,014 1,754,400
OPERATING EXPENSES:    
Selling, general and administrative 2,025,706 1,837,787
Research and development 1,679,098 1,398,368
Total operating expenses 3,704,804 3,236,155
LOSS FROM OPERATIONS (2,412,790) (1,481,755)
OTHER INCOME (EXPENSE):    
Interest expense (47) (37)
Interest and dividend income 44,014 47,764
Total other income 43,967 47,727
LOSS BEFORE INCOME TAXES (2,368,823) (1,434,028)
INCOME TAX EXPENSE (24,237) (31,800)
NET LOSS $ (2,393,060) $ (1,465,828)
BASIC NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.26) $ (0.17)
DILUTED NET LOSS PER COMMON SHARE (in Dollars per share) $ (0.26) $ (0.17)
WEIGHTED AVERAGE NUMBER OF COMMON AND COMMON EQUIVALENT SHARES    
Basic (in Shares) 9,212,557 8,570,029
Diluted (in Shares) 9,212,557 8,570,029
NET LOSS $ (2,393,060) $ (1,465,828)
OTHER COMPREHENSIVE LOSS:    
Foreign currency translation (10,395) (10,302)
COMPREHENSIVE LOSS $ (2,403,455) $ (1,476,130)