Schedule of Share-based Compensation, Stock Options, Activity (Details)	6 Months Ended
	Oct. 31, 2016 USD ($)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 1	$ 410,730
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 2	12.99
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 3	$ 90,000
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 4	2.40
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 5	$ (44,980)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 6	4.32
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 7	$ (24,540)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 8	21.08
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 9	$ 431,210
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 10	2.48
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 11	$ 243,295
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 12	2.50
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 13	$ 236,795
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 14	16.77