Earnings (loss) per common share (EPS) (Tables)

9 Months Ended

Jan. 31, 2015

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

		Three Months Ended						Nine Months Ended
		January 31,						January 31,
		2015			2014			2015			2014
Net loss	$	(525,083	)	$	(2,220,808	)	$	(3,027,240	)	$	(5,557,327	)
Weighted average common
shares outstanding – basic and
diluted		42,482,355			42,174,448			42,542,594			42,038,923
Basic and diluted EPS	$	(0.01	)	$	(0.05	)	$	(0.07	)	$	(0.13	)