Schedule of Stockholders Equity Deferred Share Unit Plan (Details) - USD ($)	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Deferred Share Units Outstanding, beginning of period	633,491
Deferred Share Units Outstanding Weighted Average Grant Date Fair Value, beginning of period	$ 5.20
Deferred Share Units Granted During Period	0	136,981
Deferred Share Units Granted During Period Weighted Average Grant Date Fair Value	$ 0
Deferred Share Units Cancelled During Period	0
Deferred Share Units Cancelled During Period Weighted Average Grant Date Fair Value	$ 0
Deferred Share Units Outstanding, end of period	633,491
Deferred Share Units Outstanding Weighted Average Grant Date Fair Value, end of period	$ 5.20