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Fair Value (Tables)
3 Months Ended
Jul. 31, 2012
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) at July 31, 2012 (in thousands):

 

Balance, May 1, 2012   $ 555  
  Transfers to (from) Level 3     -  
  Total (gains) losses included in earnings     (285 )
  Purchases, issuances and settlements, net     -  
         
Balance, July 31, 2012   $ 270