Fair Value, Liabilities Measured on Recurring Basis (Details) (USD $)	6 Months Ended
	Oct. 31, 2013
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 1	$ 9,830
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	(18,479)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 6	32,405
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 7	(1,165)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 8	(22,575)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 9	(9,814)
Derivative Financial Instruments And Risk Management Fair Value, Liabilities Measured On Recurring Basis 10	$ 9,830