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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014
Balance beginning of year | $ (2,011) |
Modification Charge | 586 | $ 0
Balance end of year | 0 | (2,011)
Fair Value, Inputs, Level 3 [Member] |  |
Balance beginning of year | (2,011) | (1,046)
Transfers to (from) Level 3 | 0 | 0
Change in fair value included in earnings | 981 | (965)
Modification Charge | (586) |
Reclassification to equity | 1,616 | 0
Balance end of year | $ 0 | $ (2,011)

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