Share-Based Payments (Tables)

6 Months Ended

Oct. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

Stock-based compensation expense was recognized as follows (table in thousands):

	Three Months Ended				Six Months Ended
	October 31,				October 31,
	2015		2014		2015		2014

General and administrative	$	674	$	513	$	1,112	$	1,055
Sales and marketing		25		179		145		333
Research and development		46		98		213		203
TOS cost of sales		2		16		26		18
POS cost of sales		1		14		27		18

Total stock-based compensation expense	$	748	$	820	$	1,523	$	1,627

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

Black-Scholes assumptions used to calculate the fair value of options granted during the three and six months ended October 31, 2015 and 2014 were as follows:

	Three Months Ended		Six Months Ended
	October 31,		October 31,
	2015	2014	2015	2014

Expected term in years	6	5 - 6	5 - 6	3 - 6
Risk-free interest rates	1.63% - 1.72%	1.53% - 1.94%	1.57% - 1.72%	0.79% - 1.94%
Volatility	87.46% - 87.81%	85.8% - 102.1%	87.46% - 92.32%	85.8% - 102.1%
Dividend yield	0%	0%	0%	0%

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

The Company’s stock options activity for the six months ended October 31, 2015 was as follows:

									Weighted
							Weighted		Average
			Directors				Average		Remaining		Aggregate
	Non-		and				Exercise		Contractual		Intrinsic
	Employees		Employees		Total		Price		Life (Years)		Value

Outstanding, May 1, 2015		57,917		1,946,085		2,004,002	$	5.74		6.7	$	4,166,000
Granted		-		89,169		89,169		6.98		9.5		-
Exercised		-		-		-		-
Forfeited		-		(35,641)		(35,641)		6.53
Expired		(6,667)		(73,102)		(79,769)		6.80

Outstanding, October 31, 2015		51,250		1,926,511		1,977,761		5.74		6.3		927,000

Vested and expected to vest as of October 31, 2015		51,250		1,926,511		1,977,761		5.74		6.3		927,000

Exercisable as of October 31, 2015		34,271		1,517,145		1,551,416		5.85		5.8		719,000

Schedule Of Share Based Compensation Warrants Activity [Table Text Block]

Activity related to these warrants, which expire at various dates through January 2019, is summarized as follows:

					Weighted
			Weighted		Average
	Number		Average		Remaining		Aggregate
	of		Exercise		Contractual		Intrinsic
	Shares		Price		Life (Years)		Value

Outstanding, May 1, 2015		2,109,840	$	5.82		4.6	$	3,247,604
Granted		-		-		-		-
Exercised		-		-		-		-
Expired		-		-		-		-

Outstanding, October 31, 2015		2,109,840	$	5.82		4.1	$	153,578