Common Stock (Tables)

3 Months Ended

Jul. 31, 2015

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended
	July 31,
	2015	2014
Risk-free interest rate	1.66%	1.65%
Expected volatility	90.23%	58.20%
Expected term	3.7 years	3.7 years
Dividend yield	0%	0%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Weighted Average
	Number of		Exercise Price
	Options		per Share
Outstanding at April 30, 2015	4,117,812		$1.52
Granted	579,000		$0.50
Forfeited/Cancelled	(193,854	)	$1.16
Outstanding at July 31, 2015	4,502,958		$1.41
Exercisable at July 31, 2015	2,290,006		$1.75
Exercisable at April 30, 2015	2,105,439		$1.77

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	Number of		Aggregate		Number of		Aggregate
	Options		Intrinsic		Options		Intrinsic
Exercise Price	Outstanding		Value	Expiry Date	Exercisable		Value
$0.45	50,000	$	–	March 9, 2020	–	$	–
$0.47	122,750		–	August 21, 2015 to September 26, 2016	122,750		–
$0.50	579,000		–	July 17, 2020	–		–
$0.52	325,000		–	March 23, 2020	–		–
$0.78	34,000		–	December 12, 2019	4,964		–
$1.05	86,375		–	September 12, 2019	25,417		–
$1.15	550,000		–	July 11, 2019	175,000		–
$1.23	20,833		–	January 13, 2019	20,833		–
$1.31	600,000		–	December 12, 2018	237,500		–
$1.41	100,000		–	October 1, 2018	43,750		–
$1.70	650,000		–	December 14, 2016	582,292		–
$1.90	845,000		–	December 14, 2015 to July 25, 2018	612,500		–
$2.15	240,000		–	September 7, 2016	240,000		–
$2.90	300,000		–	July 19, 2017	225,000		–
July 31, 2015	4,502,958	$	–		2,290,006	$	–
April 30, 2015	4,117,812	$	6,183		2,105,439	$	3,683

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

			Weighted
	Number of		Average Grant
	Options		Date Fair Value
Non-vested options at April 30, 2015	2,012,373		$0.62
Granted	579,000		$0.31
Vested	(187,796	)	$0.81
Forfeited/Cancelled	(190,625	)	$0.49
Non-vested options at July 31, 2015	2,212,952		$0.54

Schedule of Employee and Non-Employee Service Share-based Compensation Allocation of Recognized Period Costs [Table Text Block]

		Three Months Ended
		July 31,
		2015		2014
Cost of sales	$	14,687	$	18,476
Sales and marketing		68,930		60,888
Research and development		17,564		15,546
General and administrative		55,889		61,191
Total stock-option based compensation	$	157,070	$	156,101

Schedule of Stockholders Equity Deferred Share Unit Plan [Table Text Block]

			Weighted
			Average Grant
			Date Fair
	Number of DSUs		Value Per Unit
DSUs outstanding at April 30, 2015	1,999,047	$	1.10
Granted	550,338	$	0.52
DSUs outstanding at July 31, 2015	2,549,385	$	0.98

Schedule of Stockholders Equity Non Vested Deferred Share Units [Table Text Block]

				Weighted
				Average Grant
				Date Fair
	Number of DSUs			Value Per Unit
Non-vested DSUs at April 30, 2015	251,690		$	1.46
Granted	550,338		$	0.52
Vested	(416,809	)	$	0.82
Non-vested DSUs at July 31, 2015	385,219		$	0.82

Schedule of Allocation of Share Based Compensation Costs for Deferred Share Units [Table Text Block]

		Three Months Ended
		July 31,
		2015		2014
Sales and marketing	$	–	$	1,667
Research and development		1,633		2,082
General and administrative		202,819		208,762
Total DSU based compensation	$	204,452	$	212,511