Fair Value, Liabilities Measured on Recurring Basis (Details)	6 Months Ended
	Oct. 31, 2016 USD ($)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 1	$ 0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 2	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 3	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 4	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 5	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 6	(47,690)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 7	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 8	47,690
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 9	0
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 10	$ 0