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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jan. 31, 2019
Apr. 30, 2018
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 33,892 $ 34,171
Less accumulated depreciation (24,927) (24,426)
Property, plant and equipment, net 8,965 9,745
Land, buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 15,956 15,932
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 17,936 $ 18,239