Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)	6 Months Ended	12 Months Ended
	Oct. 31, 2016	Apr. 30, 2016
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 1	$ 1,919,765
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 2	$ 1,919,765
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 1		$ 2,159,738
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 2		$ 2,159,738