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Capital Lease (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Apr. 30, 2012
Future minimum lease payments    
2013 $ 298  
2014 596  
2015 596  
2016 596  
2017 1,494  
Total future minimum lease payments 3,580  
Less amounts representing interests (506)  
Present value of minimum lease payments 3,074  
Less current maturities of capital lease (430) (418)
Long-term maturities of capital lease $ 2,644