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Fair Value (Tables) | 9 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Apr. 30, 2014
Fair Value Disclosures [Abstract] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table presents information about our warrants liability, which was our only financial instrument measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of January 31, 2015 and April 30, 2014 (in thousands):
Balance, May 1, 2014 |  | $ | (2,011) |
Transfers to (from) Level 3 |  |  | - |
Total (gains) losses included in earnings |  |  | 1,401 |
Purchases, issuances and settlements, net |  |  | - |
Balance, January 31, 2015 |  | $ | (610) |
| The following table presents information about our warrant liability, which was our only financial instrument measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of April 30 (dollars in thousands):
|  | 2014 |  | 2013 |
Balance beginning of year |  | $ | (1,046) |  | $ | (555) |
Transfers to (from) Level 3 |  |  | - |  |  | - |
Total gains (losses) included in earnings |  |  | (965) |  |  | (74) |
Issuances |  |  | - |  |  | (417) |
Balance end of year |  | $ | (2,011) |  | $ | (1,046) |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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