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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Net sales $ 1,261,161 $ 1,375,666 $ 4,034,822 $ 4,433,785
Cost of sales (895,237) (910,295) (2,923,615) (2,947,652)
Gross profit 365,924 465,371 1,111,207 1,486,133
Operating Expense:        
Selling, general and administrative 576,070 434,658 1,488,890 1,409,164
Research and development 497,102 353,559 1,270,288 914,581
Total operating expenses 1,073,172 788,217 2,759,178 2,323,745
Loss from operations (707,248) (322,846) (1,647,971) (837,612)
Other Income (Expense):        
Dividend and interest income 28,502 355 40,288 39,438
Interest expense (47) (37)
Total other income 28,502 355 40,241 39,401
Loss before income taxes (678,746) (322,491) (1,607,730) (798,211)
Provision for income taxes
Net loss $ (678,746) $ (322,491) $ (1,607,730) $ (798,211)
Basic net loss per common share (in Dollars per share) $ (0.07) $ (0.04) $ (0.18) $ (0.09)
Diluted net loss per common share (in Dollars per share) $ (0.07) $ (0.04) $ (0.18) $ (0.09)
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 9,322,549 8,556,480 9,103,225 8,529,009
Diluted (in Shares) 9,322,549 8,556,480 9,103,225 8,529,009
Net loss $ (678,746) $ (322,491) $ (1,607,730) $ (798,211)
Other comprehensive loss, net of tax:        
Foreign currency translation (1,579) (1,140) (7,385) (6,308)
Comprehensive loss $ (680,325) $ (323,631) $ (1,615,115) $ (804,519)