Property, Plant and Equipment and Leases (Tables)

12 Months Ended

Apr. 30, 2020

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Property, plant and equipment, net at April 30, 2020 and 2019, consisted of the following (in thousands):

	2020			2019
Buildings and building improvements	$	2,692		$	2,692
Machinery, equipment and furniture		57,916			57,157
		60,608			59,849
Less, accumulated depreciation and amortization		(49,341	)		(46,811	)
	$	11,267		$	13,038