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Significant Accounting Policies (Details) - Inventories - USD ($)
Feb. 29, 2016
May. 31, 2015
Inventories [Abstract]    
Raw materials $ 1,061,000 $ 958,000
Work in progress 791,000 831,000
Finished products 248,000 238,000
Total $ 2,100,101 $ 2,027,372