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Significant Accounting Policies (Details) - Inventories - USD ($)
Nov. 30, 2015
May. 31, 2015
Inventories [Abstract]    
Raw materials $ 1,071,000 $ 958,000
Work in progress 842,000 831,000
Finished products 324,000 238,000
Total $ 2,237,394 $ 2,027,372