Schedule of Stockholders Equity Deferred Share Unit Plan (Details)	6 Months Ended
	Oct. 31, 2016 USD ($)
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 1	$ 254,939
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 2	9.79
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 3	90,453
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 4	2.40
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 5	345,392
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 6	$ 7.85