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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jul. 31, 2016
Apr. 30, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 35,057 $ 35,004
Less accumulated depreciation (23,380) (23,007)
Property, plant and equipment, net 11,677 11,997
Land, Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,868 15,864
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 19,189 $ 19,140