Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Inventories (Details)

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Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
Apr. 30, 2016
Apr. 30, 2015
Accounting Policies [Abstract]    
Raw materials $ 955,000 $ 1,125,000
Work in progress 5,000 2,000
Finished goods 566,000 1,176,000
Allowance for excess and slow moving (190,000) (214,000)
Inventories, net $ 1,336,000 $ 2,089,000