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Inventories (Details) (USD $)
Oct. 31, 2014
Apr. 30, 2014
Inventory, Net $ 2,025,000 $ 1,455,000
Raw Materials, Net of Reserves [Member]
   
Inventory, Raw Materials, Net of Reserves 1,162,000 955,000
Work in Process [Member]
   
Inventory, Work in Process, Net of Reserves 538,000 261,000
Finished Goods, Net of Reserves [Member]
   
Inventory, Finished Goods, Net of Reserves 325,000 239,000
Inventory Type [Domain]
   
Inventory, Net $ 2,025,000 $ 1,455,000