Significant Accounting Policies (Schedule of Basic and diluted income per share) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Numerator
Net income (loss)	$ 7,377	$ (674,964)	$ (381,530)	$ (2,138,091)
Denominator
Weighted average common shares outstanding	11,467,345	10,694,730	11,419,270	10,689,300
Denominator	13,040,970	10,694,730	11,419,270	10,689,300
Basic [Member]
Numerator
Net income applicable to common stock	$ 7,377
Convertible debt interest
Net income (loss)	$ 7,377
Denominator
Weighted average common shares outstanding	11,467,345
Convertible debt
Warrants and options
Denominator	11,467,345
Net income per share	$ 0
Diluted [Member]
Numerator
Net income applicable to common stock	$ 7,377
Convertible debt interest	4,010
Net income (loss)	$ 11,387
Denominator
Weighted average common shares outstanding	11,467,345
Convertible debt	75,596
Warrants and options	1,498,029
Denominator	13,040,970
Net income per share	$ 0