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Fair Value (Tables)
9 Months Ended
Jan. 31, 2015
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)