Schedule of Nonvested Performance-based Units Activity (Details)	3 Months Ended
	Jul. 31, 2015 USD ($)
Common Stock Schedule Of Nonvested Performance-based Units Activity 1	$ 2,012,373
Common Stock Schedule Of Nonvested Performance-based Units Activity 2	0.62
Common Stock Schedule Of Nonvested Performance-based Units Activity 3	579,000
Common Stock Schedule Of Nonvested Performance-based Units Activity 4	0.31
Common Stock Schedule Of Nonvested Performance-based Units Activity 5	(187,796)
Common Stock Schedule Of Nonvested Performance-based Units Activity 6	0.81
Common Stock Schedule Of Nonvested Performance-based Units Activity 7	(190,625)
Common Stock Schedule Of Nonvested Performance-based Units Activity 8	0.49
Common Stock Schedule Of Nonvested Performance-based Units Activity 9	2,212,952
Common Stock Schedule Of Nonvested Performance-based Units Activity 10	$ 0.54