Common Stock (Tables)

6 Months Ended

Oct. 31, 2013

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

	Six Months Ended
	October 31, 2013	October 31, 2012
Risk-free interest rate	1.31%	0.62%
Expected volatility	78.94%	74.47%
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, 2013	3,930,818		$1.33
Granted	1,055,000		$1.67
Exercised	(231,655	)	$0.47
Forfeited/Cancelled	(18,604	)	$1.86
Expired	(40,000	)	$0.47
Outstanding at October 31, 2013	4,695,559		$1.45
Exercisable at October 31, 2013	2,682,368		$1.14
Exercisable at April 30, 2013	2,677,887		$1.00

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
$0.44	227,541	$	172,704	December 15, 2013	227,541	$	172,704
$0.47	173,270		126,314	January 1, 2014 to September 26, 2016	173,270		126,314
$0.60	388,873		232,935	December 14, 2014	372,527		223,144
$0.62	850,000		492,150	April 17, 2014	850,000		492,150
$1.41	100,000		–	October 1, 2018	–		–
$1.44	250,000		–	September 12, 2018	–		–
$1.53	200,000		–	August 29, 2018	–		–
$1.70	750,000		–	December 14, 2016	343,749		–
$1.88	30,000		–	December 13, 2017	6,250		–
$1.90	916,875		–	December 14, 2015 to July 25, 2018	290,832		–
$2.00	12,000		–	December 31, 2014 to February 28, 2015	12,000		–
$2.15	240,000		–	September 7, 2016	240,000		–
$2.26	200,000		–	March 14, 2018	37,302		–
$2.27	52,000		–	March 10, 2016	33,584		–
$2.90	305,000		–	July 19, 2017	95,313		–
October 31, 2013	4,695,559	$	1,024,103		2,682,368	$	1,014,312
April 30, 2013	3,930,818	$	2,636,687		2,677,887	$	2,464,253

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, 2013	1,252,931		$1.09
Granted	1,055,000		$0.89
Vested	(285,053	)	$0.98
Cancelled/Forfeited	(9,687	)	$1.08
Non-vested options at October 31, 2013	2,013,191		$1.00

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

		Three Months Ended				Six Months Ended
		October 31,				October 31,
		2013		2012		2013		2012
Cost of sales	$	18,285	$	8,797	$	26,838	$	17,636
Sales and marketing		107,933		73,072		197,273		127,007
Research and development		15,851		10,531		24,537		21,247
General and administrative		37,083		55,100		70,570		111,043
Total stock-option based compensation	$	179,152	$	147,500	$	319,218	$	276,933

Schedule of Stockholders' Equity Note, Warrant Liability [Table Text Block]

		October 31,			April 30,
		2013			2013
Opening balance at the beginning of the period/year	$	93,057		$	2,026,944
Fair value of warrant liability, at issuance		–			–
Change in fair value of warrant liability		(93,057	)		(1,753,368	)
Fair value of warrants exercised during the period/year		–			(180,519	)
Fair value of warrant liability at end of period/year	$	–		$	93,057

Schedule of Stockholders' Equity Note, Warrants or Rights, Valuation Assumptions [Table Text Block]

			As at the date of
	As at	As at	issuance
	October 31, 2013	April 30, 2013	June 14, 2011
Risk-free interest rate	–	0.11%	1.60%
Expected volatility	–	70%	70%
Expected term	–	0.12 years	1.5 years to 2 years
Dividend yield	–	0%	0%

Schedule of Stockholders' Equity Note, Warrants or Rights, Activity [Table Text Block]

	Number of		Weighted Average
	Warrants		Exercise Price	Expiry Dates
Warrants at April 30, 2013	2,248,399		2.57	June 14, 2013 to June 19, 2014
Granted	–		–	–
Exercised	–		–	–
Expired	(1,515,899	)	2.25	June 14, 2013
Warrants at October 31, 2013	732,500		3.25	June 19, 2014

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

			Weighted Average
			Grant Date Fair
	Number of DSU’s		Value Per Unit
DSUs outstanding at April 30, 2013	1,643,119		$1.02
Granted	191,066		$1.90
Conversions	(73,334	)	$1.00
DSUs outstanding at October 31, 2013	1,760,851		$1.10

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

			Weighted Average
			Grant Date Fair
	Number of DSU’s		Value Per Unit
Non-vested DSUs at April 30, 2013	207,444		$1.98
Granted	191,066		$1.90
Vested	(227,048	)	$1.79
Non-vested DSUs at October 31, 2013	171,462		$2.19

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

		Three Months Ended				Six Months Ended
		October 31,				October 31,
		2013		2012		2013		2012
Sales and marketing	$	6,667	$	4,167	$	13,334	$	8,334
Research and development		2,082		2,082		4,164		2,354
General and administrative		74,592		60,856		300,327		323,754
Total DSU-based compensation	$	83,341	$	67,105	$	317,825	$	334,442