Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Product Warranty Accruals (Details)

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Summary of Significant Accounting Policies - Schedule of Product Warranty Accruals (Details) - USD ($)
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Accounting Policies [Abstract]    
Balance beginning of year $ 10,000 $ 10,000
Charges to costs and expenses
Deductions (5,500)
Balance end of year $ 4,500 $ 10,000