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Commitments and Contingencies (Tables)
 12 Months Ended
May 31, 2013
Warranty and Commitments and Contingencies [Abstract]  
Amounts of obligations from repurchased units and incurred net losses for the periods

The amounts of obligations from repurchased units and incurred net losses for the periods presented are as follows:

 

                 
    Year ended May 31,  
    2013     2012  
    (Dollars in thousands)  

Number of units repurchased

     3       —  

Obligations from units repurchased

   $ 31     $ —  

Net losses on repurchased units

   $ —     $ —  
Future minimum lease commitments under operating leases

Future minimum lease commitments under operating leases are as follows:

 

         

Year ending May 31,

   Amount  
    (Dollars in
thousands)		  

2014

   $ 352  

2015

     269  

2016

     192  

2017

     95  

2018

     36  

Thereafter

     10  
   

 

 

  
    $ 954