Schedule of Nonvested Performance-based Units Activity (Details) (USD $)	12 Months Ended
	Apr. 30, 2014
Common Stock Schedule Of Nonvested Performance-based Units Activity 1	$ 1,838,237
Common Stock Schedule Of Nonvested Performance-based Units Activity 2	0.82
Common Stock Schedule Of Nonvested Performance-based Units Activity 3	540,000
Common Stock Schedule Of Nonvested Performance-based Units Activity 4	1.38
Common Stock Schedule Of Nonvested Performance-based Units Activity 5	(863,077)
Common Stock Schedule Of Nonvested Performance-based Units Activity 6	0.73
Common Stock Schedule Of Nonvested Performance-based Units Activity 7	(262,229)
Common Stock Schedule Of Nonvested Performance-based Units Activity 8	0.98
Common Stock Schedule Of Nonvested Performance-based Units Activity 9	1,252,931
Common Stock Schedule Of Nonvested Performance-based Units Activity 10	1.09
Common Stock Schedule Of Nonvested Performance-based Units Activity 11	1,905,000
Common Stock Schedule Of Nonvested Performance-based Units Activity 12	0.79
Common Stock Schedule Of Nonvested Performance-based Units Activity 13	(613,483)
Common Stock Schedule Of Nonvested Performance-based Units Activity 14	0.99
Common Stock Schedule Of Nonvested Performance-based Units Activity 15	(606,530)
Common Stock Schedule Of Nonvested Performance-based Units Activity 16	0.94
Common Stock Schedule Of Nonvested Performance-based Units Activity 17	1,937,918
Common Stock Schedule Of Nonvested Performance-based Units Activity 18	$ 0.87