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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Apr. 30, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 34,284 $ 34,345
Less accumulated depreciation (24,038) (23,493)
Property, plant and equipment, net 10,246 10,852
Land, Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,924 15,995
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 18,360 $ 18,350