Schedule of Share-based Compensation, Stock Options, Activity (Details)	6 Months Ended
	Oct. 31, 2017 USD ($)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 1	$ 396,922
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 2	2.46
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 3	(11,426)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 4	2.49
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 5	(30,000)
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 6	2.50
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 7	355,496
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 8	2.45
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 9	225,847
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 10	2.48
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 11	221,739
Common Stock Schedule Of Share-based Compensation, Stock Options, Activity 12	$ 2.49