Note 7 - Related Party Transactions (Tables)

9 Months Ended

Jan. 31, 2018

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)	2018		2017		2018		2017
Non-voting revenues interest in EAM	$	2,057	$	1,803	$	6,074	$	5,389
Non-voting profits interest in EAM		227		131		583		393
	$	2,284	$	1,934	$	6,657	$	5,782