Note 7 - Related Party Transactions (Tables)

9 Months Ended

Jan. 31, 2021

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)	2021		2020		2021		2020
Non-voting revenues interest in EAM	$	4,104	$	3,033	$	11,113	$	8,389
Non-voting profits interest in EAM		630		422		1,479		995
	$	4,734	$	3,455	$	12,592	$	9,384