PROPERTY, PLANT AND EQUIPMENT: (Tables)

12 Months Ended

Apr. 30, 2017

Property, Plant and Equipment Disclosure [Abstract]

Property, Plant and Equipment [Table Text Block]

	April 30,
	2017		2016
	(in thousands)
Land, buildings and improvements	$	15,995	$	15,864
Furniture and equipment		18,350		19,140
		34,345		35,004
Less accumulated depreciation		(23,493)		(23,007)
	$	10,852	$	11,997