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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Net sales $ 1,500,791 $ 1,613,636 $ 2,773,661 $ 3,058,119
Cost of sales (1,092,731) (1,107,445) (2,028,378) (2,037,357)
Gross profit 408,060 506,191 745,283 1,020,762
Operating Expenses:        
Selling, general and administrative 512,592 522,492 912,820 974,506
Research and development 381,405 272,437 773,186 561,022
Total operating expenses 893,997 794,929 1,686,006 1,535,528
Loss from operations (485,937) (288,738) (940,723) (514,766)
Other Income (Expense):        
Dividend and interest income 8,693 20,114 11,786 39,083
Interest expense (37) (47) (37)
Total other income 8,693 20,077 11,739 39,046
Loss before income tax (477,244) (268,661) (928,984) (475,720)
Provision for income taxes
Net loss $ (477,244) $ (268,661) $ (928,984) $ (475,720)
Basic net loss per common share (in Dollars per share) $ (0.05) $ (0.03) $ (0.10) $ (0.06)
Diluted net loss per common share (in Dollars per share) $ (0.05) $ (0.03) $ (0.10) $ (0.06)
Weighted average number of common and common equivalent shares:        
Basic (in Shares) 9,061,617 8,519,784 8,995,575 8,515,499
Diluted (in Shares) 9,061,617 8,519,784 8,995,575 8,515,499
Net loss $ (477,244) $ (268,661) $ (928,984) $ (475,720)
Other comprehensive loss, net of tax:        
Foreign currency translation (4,480) (4,344) (5,806) (5,168)
Comprehensive loss $ (481,724) $ (273,005) $ (934,790) $ (480,888)