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

9 Months Ended

Jan. 31, 2023

Notes Tables

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

	As of January 31, 2023
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	11,233	$	-	$	-	$	11,233
Equity securities		17,986		-		-		17,986
Available-for-sale fixed income securities		30,930		-		-		30,930
	$	60,149	$	-	$	-	$	60,149

	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