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Intangibles (Tables)
 12 Months Ended
Apr. 30, 2014
Intangibles  
Schedule of components of intangibles
  April 30,  
 
   2014   2013  
 
   (In thousands)
  

Licenses

   $ 856   $ 850  

Less accumulated amortization

     (189 )   (35 )
           
​ ​ ​ ​ ​ ​ ​ ​

Intangibles, net

   $ 667   $ 815  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of estimated amortization expense for the next five years

 

 

 
   Year ending
April 30		  
 
   (In thousands)
  

2015

   $ 223  

2016

     223  

2017

     221  

2018

     —  

2019

     —  
       
​ ​ ​ ​ ​

 

   $ 667  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​