Organization, Use of Estimates and Basis of Presentation (Tables)

9 Months Ended

Jan. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended				Nine Months Ended
	January 31,				January 31,
	2016		2015		2016		2015
Basic loss per share computation
Net loss attributable to common stockholders	$	(2,412,381)	$	(2,816,465)	$	(7,872,115)	$	(9,462,281)
Weighted Average common shares – basic		8,702,237		5,574,447		8,702,237		5,574,244
Basic net loss per share	$	(0.28)	$	(0.51)	$	(0.90)	$	(1.70)
Diluted loss per share computation
Net loss attributable to common stockholders	$	(2,412,381)	$	(2,816,465)	$	(7,872,115)	$	(9,462,281)
Less: Gain on derivative warrant liability		-		620,687		-		1,401,314
Loss available to common stockholders	$	(2,412,381)	$	(3,437,152)	$	(7,872,115)	$	(10,863,595)
Weighted Average common shares		8,702,237		5,574,447		8,702,237		5,574,244
Incremental shares from assumed exercise of warrants and stock options		-		29,351		-		29,351
Adjusted weighted average share – diluted		8,702,237		5,603,798		8,702,237		5,603,595
Diluted net loss per share	$	(0.28)	$	(0.61)	$	(0.90)	$	(1.94)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table reflects the total potential share-based instruments outstanding at January 31, 2016 and 2015 that could have an effect on the future computation of dilution per common share:

	January 31,
	2016		2015
Stock options		2,212,571		1,999,167
Warrants		2,109,840		260,556
Total common stock equivalents		4,322,411		2,259,723