Note 1 - Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2022

Notes Tables

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	As of April 30, 2022
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	28,965	$	-	$	-	$	28,965
Equity securities		17,647		-		-		17,647
Available-for-sale fixed income securities		10,475		-		-		10,475
	$	57,087	$	-	$	-	$	57,087

	As of April 30, 2021
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	18,209	$	-	$	-	$	18,209
Equity securities		23,582		-		-		23,582
Available-for-sale fixed income securities		2,600		-		-		2,600
	$	44,391	$	-	$	-	$	44,391