Schedule of Stockholders Equity Non Vested Deferred Share Units (Details)	6 Months Ended
	Oct. 31, 2016 USD ($)
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 1	$ 38,522
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 2	8.15
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 3	90,453
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 4	2.40
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 5	(82,758)
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 6	3.86
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 7	46,217
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 8	$ 4.58