Note 7 - Related Party Transactions (Tables)

9 Months Ended

Jan. 31, 2019

Notes Tables

Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block]

	Three Months Ended January 31,				Nine Months Ended January 31,
($ in thousands)	2019		2018		2019		2018
Non-voting revenues interest in EAM	$	1,997	$	2,057	$	6,060	$	6,074
Non-voting profits interest in EAM		213		227		805		583
	$	2,210	$	2,284	$	6,865	$	6,657