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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Net sales $ 1,499,930 $ 1,361,608 $ 4,342,247 $ 3,813,683
Cost of sales (1,050,503) (1,017,090) (2,759,169) (2,635,701)
Gross profit 449,427 344,518 1,583,078 1,177,982
Operating Expenses:        
Selling, general and administrative 510,428 428,356 1,404,334 1,159,624
Research and development 256,721 185,270 781,929 573,473
Total operating expenses 767,149 613,626 2,186,263 1,733,097
Loss from operations (317,722) (269,108) (603,185) (555,115)
Other Income (Expense):        
Dividend and interest income 13,681 9,175 40,724 27,134
Interest expense (100) (69) (280) (124)
Total other income 13,581 9,106 40,444 27,010
Loss before income tax benefit (304,141) (260,002) (562,741) (528,105)
Income tax benefit 125,000 254,000
Net loss $ (304,141) $ (135,002) $ (562,741) $ (274,105)
Basic net loss per common share (in Dollars per share) $ (0.04) $ (0.02) $ (0.07) $ (0.04)
Diluted net loss per common share (in Dollars per share) $ (0.04) $ (0.02) $ (0.07) $ (0.04)
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 8,433,932 7,617,272 8,269,791 7,595,273
Diluted (in Shares) 8,433,932 7,617,272 8,269,791 7,595,273
Net loss $ (304,141) $ (135,002) $ (562,741) $ (274,105)
Other comprehensive loss, net of tax:        
Foreign currency translation (241) (73) (1,001) (1,439)
Comprehensive loss $ (304,382) $ (135,075) $ (563,742) $ (275,544)