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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Net sales $ 1,375,666 $ 1,499,930 $ 4,433,785 $ 4,342,247
Cost of sales (910,295) (1,050,503) (2,947,652) (2,759,169)
Gross profit 465,371 449,427 1,486,133 1,583,078
Operating Expense:        
Selling, general and administrative 434,658 510,428 1,409,164 1,404,334
Research and development 353,559 256,721 914,581 781,929
Total operating expenses 788,217 767,149 2,323,745 2,186,263
Loss from operations (322,846) (317,722) (837,612) (603,185)
Other Income (Expense):        
Dividend and interest income 355 13,681 39,438 40,724
Interest expense (100) (37) (280)
Total other income 355 13,581 39,401 40,444
Loss before income taxes (322,491) (304,141) (798,211) (562,741)
Income taxes
Net loss $ (322,491) $ (304,141) $ (798,211) $ (562,741)
Basic net loss per common share (in Dollars per share) $ (0.04) $ (0.04) $ (0.09) $ (0.07)
Diluted net loss per common share (in Dollars per share) $ (0.04) $ (0.04) $ (0.09) $ (0.07)
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 8,556,480 8,433,932 8,529,009 8,269,791
Diluted (in Shares) 8,556,480 8,433,932 8,529,009 8,269,791
Net loss $ (322,491) $ (304,141) $ (798,211) $ (562,741)
Other comprehensive loss, net of tax:        
Foreign currency translation (1,140) (241) (6,308) (1,001)
Comprehensive loss $ (323,631) $ (304,382) $ (804,519) $ (563,742)