XML 30 R19.htm IDEA: XBRL DOCUMENT v3.19.1
Significant Accounting Policies (Details) - Inventories - USD ($)
Feb. 28, 2019
May 31, 2018
Inventories [Abstract]    
Raw materials $ 1,036,000 $ 1,000,000
Work in progress 832,000 854,000
Finished products 212,000 325,000
Total $ 2,080,284 $ 2,178,777