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INVENTORIES (Details) - USD ($)
Jul. 31, 2019
Apr. 30, 2019
INVENTORIES    
Raw materials $ 1,786,000 $ 1,723,000
Work in process 1,345,000 1,052,000
Finished goods 125,000 279,000
Inventories $ 3,256,000 $ 3,054,000