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SIGNIFICANT ACCOUNTING POLICIES (Details) - Inventories - USD ($)
Feb. 28, 2022
May 31, 2021
Inventories [Abstract]    
Raw materials $ 1,360,000 $ 1,583,000
Work in progress 714,000 1,006,000
Finished products 1,157,000 617,000
Total $ 3,231,430 $ 3,206,255