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Organization, Use of Estimates and Basis of Presentation (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Apr. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | January 31, |  |  | January 31, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Basic loss per share computation |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (2,816,465 | ) |  | $ | (574,207 | ) |  | $ | (9,462,281 | ) |  | $ | (5,133,684 | )
Weighted Average common shares - basic |  |  | 66,893,364 |  |  |  | 66,867,114 |  |  |  | 66,890,929 |  |  |  | 66,860,792 |
Basic net loss per share |  | $ | (0.04 | ) |  | $ | (0.01 | ) |  | $ | (0.14 | ) |  | $ | (0.08 | )
Diluted loss per share computation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ | (2,816,465 | ) |  | $ | (574,207 | ) |  | $ | (9,462,281 | ) |  | $ | (5,133,684 | )
Less: Gain on derivative warrant liability |  |  | 620,687 |  |  |  | 845,774 |  |  |  | 1,401,314 |  |  |  | - |
Loss available to common stockholders |  | $ | (3,437,152 | ) |  | $ | (1,419,981 | ) |  | $ | (10,863,595 | ) |  | $ | (5,133,684 | )
Weighted Average common shares |  |  | 66,893,364 |  |  |  | 66,867,114 |  |  |  | 66,890,929 |  |  |  | 66,860,792 |
Incremental shares from assumed exercise of warrants and stock options |  |  | 352,213 |  |  |  | - |  |  |  | 352,213 |  |  |  | - |
Adjusted weighted average share - diluted |  |  | 67,245,577 |  |  |  | 66,867,114 |  |  |  | 67,243,142 |  |  |  | 66,860,792 |
Diluted net loss per share |  | $ | (0.05 | ) |  | $ | (0.02 | ) |  | $ | (0.16 | ) |  | $ | (0.08 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table reflects the total potential share-based instruments outstanding at January 31, 2015 and 2014 that could have an effect on the future computation of dilution per common share:
|  | January 31, |
|  | 2015 |  |  | 2014 |
Stock options |  |  | 23,990,008 |  |  |  | 22,633,955 |
Warrants |  |  | 3,126,667 |  |  |  | 3,276,667 |
Total common stock equivalents |  |  | 27,116,675 |  |  |  | 25,910,622 |
| The following table reflects the total potential share-based instruments outstanding at April 30, 2014 and 2013, that could have an effect on the future computation of dilution per common share:
|  | Year Ended April 30, |
|  | 2014 |  | 2013 |
Stock options |  |  | 23,351,037 |  |  | 13,890,205 |
Warrants |  |  | 3,276,667 |  |  | 3,276,667 |
Restricted stock |  |  | - |  |  | 50,000 |
Total common stock equivalents |  |  | 26,627,704 |  |  | 17,216,872 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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