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COMMITMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
COMMITMENTS [Abstract]      
Initial lease term three (3) years, (5) years, ten (10) years, and twenty five (25) years.    
Total rental expense $ 5,030 $ 4,983 $ 5,012
Minimum lease and rent agreement commitments [Abstract]      
2014 4,995    
2015 4,971    
2016 4,978    
2017 4,929    
2018 4,946    
Operating lease future minimum payments due $ 24,819