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Fair Value (Tables)
9 Months Ended
Jan. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table presents information about the Company’s warrants liability, which was the only financial instrument measured at fair value on a recurring basis using significant unobservable inputs (Level 3) at January 31, 2013 (in thousands):

Balance, May 1, 2012   $ 555  
Transfers to (from) Level 3     -  
Total (gains) losses included in earnings     21  
Purchases, issuances and settlements, net     417  
         
Balance, January 31, 2013   $ 993