Organization and Basis of Presentation - Narrative (Details)		12 Months Ended
	Oct. 15, 2013	Apr. 30, 2017 USD ($) subsidiary	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating subsidiaries | subsidiary		2
Reverse stock split conversion ratio	0.0833
Net loss		$ 6,883,882	$ 10,445,537
Accumulated deficit		69,350,000	62,466,000
Negative working capital		1,600,000
Cash and cash equivalents		$ 3,295,000	$ 2,585,000	$ 9,357,000