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Share-Based Payments (Tables) | 6 Months Ended
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Oct. 31, 2014
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 (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | October 31, |  | October 31, |
|  | 2014 |  | 2013 |  | 2014 |  | 2013 |
General and administrative |  | $ | 513 |  | $ | 401 |  | $ | 1,055 |  | $ | 820 |
Sales and marketing |  |  | 179 |  |  | 63 |  |  | 333 |  |  | 126 |
Research and development |  |  | 98 |  |  | 3 |  |  | 203 |  |  | 16 |
TOS cost of sales |  |  | 16 |  |  | 3 |  |  | 18 |  |  | 11 |
POS cost of sales |  |  | 14 |  |  | 6 |  |  | 18 |  |  | 55 |
Total stock-based compensation expense |  | $ | 820 |  | $ | 476 |  | $ | 1,627 |  | $ | 1,028 |
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, 2014 and 2013 were as follows (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | October 31, |  | October 31, |
|  | 2014 |  | 2013 |  | 2014 |  | 2013 |
Expected term in years |  | 5.0 - 6.0 |  | 6.0 |  | 3.0 - 6.0 |  | 6.0 |
Risk-free interest rates |  | 1.53% - 1.94% |  | 1.13% - 2.41% |  | 0.79% - 1.94% |  | 1.13% - 2.41% |
Volatility |  | 85.8% - 102.1% |  | 97.9% - 101.4% |  | 85.8% - 102.1% |  | 97.9% - 101.4% |
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, 2014 is as follows:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  |  | Weighted |  | Average |  |  |  |
|  |  |  | Directors |  |  |  | Average |  | Remaining |  | Aggregate |
|  | Non- |  | and |  |  |  | Exercise |  | Contractual |  | Intrinsic |
|  | Employees |  | Employees |  | Total |  | Price |  | Life (Years) |  | Value |
Outstanding, May 1, 2014 |  | 765,000 |  | 22,586,037 |  | 23,351,037 |  | $ | 1.01 |  | 7.5 |  | $ | 985 |
Granted |  | 80,000 |  | 1,013,175 |  | 1,093,175 |  |  | 0.72 |  | 6.1 |  |  | 74 |
Exercised |  | - |  | (3,750) |  | (3,750) |  |  | 0.49 |  |  |  |  |  |
Forfeited |  | - |  | (11,250) |  | (11,250) |  |  | 0.49 |  |  |  |  |  |
Expired |  | (150,000) |  | (22,500) |  | (172,500) |  |  | 1.12 |  |  |  |  |  |
Outstanding, October 31, 2014 |  | 695,000 |  | 23,561,712 |  | 24,256,712 |  |  | 1.00 |  | 7.0 |  |  | 334 |
Vested and expected to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
vest as of October 31, 2014 |  | 695,000 |  | 23,561,712 |  | 24,256,712 |  |  | 1.00 |  | 7.0 |  |  | 334 |
Exercisable as of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October 31, 2014 |  | 487,500 |  | 15,366,589 |  | 15,854,089 |  |  | 0.90 |  | 6.1 |  |  | 269 |
Schedule Of Share Based Compensation Warrants Activity [Table Text Block] | Activity related to these warrants, which expire at various dates through April 2016, is summarized as follows (dollars in thousands):
|  |  |  |  |  |  | Weighted |
|  |  |  | Weighted |  | Average |
|  | Number |  | Average |  | Remaining |
|  | of |  | Exercise |  | Contractual |
|  | Shares |  | Price |  | Life (Years) |
Outstanding, May 1, 2014 |  | 3,276,667 |  | $ | 0.61 |  | 2.9 |
Granted |  | - |  |  | - |  | - |
Exercised |  | - |  |  | - |  | - |
Expired |  | (150,000) |  |  | - |  | - |
Outstanding, October 31, 2014 |  | 3,126,667 |  | $ | 0.60 |  | 2.5 |
Schedule Of Share Based Payment Award Stock Warrants Valuation Assumptions [Table Text Block] | Assumptions used to calculate the fair value of these warrants were as follows:
|  | October 31, |  | April 30, |
|  | 2014 |  | 2014 |
Expected term in years |  | 1.4 - 3.2 |  | 1.9 - 3.7 |
Risk-free interest rates |  | 0.4% - 1.05% |  | 0.4% - 1.17% |
Volatility |  | 74% - 97% |  | 95% - 113% |
Dividend yield |  | 0% |  | 0% |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for warrants that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock warrants, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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