PROPERTY, PLANT AND EQUIPMENT (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation	[1]	$ 286	$ 314	$ 573	$ 635

[1] Revenue information provided for each segment includes amounts grouped as Other in the accompanying consolidated statements of operations. Corporate and Other is net of intercompany eliminations.