Earnings (loss) per common share (Tables)

6 Months Ended

Oct. 31, 2013

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

		Three Months Ended						Six Months Ended
		October 31,						October 31,
		2013			2012			2013			2012
Net income (loss)	$	(2,111,228	)	$	(325,105	)	$	(3,336,519	)	$	542,433
Weighted average common shares outstanding – basic and diluted (1)		42,007,439			41,592,776			41,971,160			41,159,949
Basic and diluted EPS	$	(0.05	)	$	(0.01	)	$	(0.08	)	$	0.01