Schedule of Nonvested Performance-based Units Activity (Details)	6 Months Ended
	Oct. 31, 2017 USD ($)
Common Stock Schedule Of Nonvested Performance-based Units Activity 1	$ 175,183
Common Stock Schedule Of Nonvested Performance-based Units Activity 2	3.49
Common Stock Schedule Of Nonvested Performance-based Units Activity 3	(41,700)
Common Stock Schedule Of Nonvested Performance-based Units Activity 4	4.17
Common Stock Schedule Of Nonvested Performance-based Units Activity 5	(3,834)
Common Stock Schedule Of Nonvested Performance-based Units Activity 6	2.12
Common Stock Schedule Of Nonvested Performance-based Units Activity 7	129,649
Common Stock Schedule Of Nonvested Performance-based Units Activity 8	$ 2.26