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

9 Months Ended

Jan. 31, 2021

Notes Tables

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

	As of January 31, 2021
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	15,286	$	-	$	-	$	15,286
Securities available-for-sale		23,517		-		-		23,517
	$	38,803	$	-	$	-	$	38,803

	As of April 30, 2020
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	2,115	$	-	$	-	$	2,115
Securities available-for-sale		29,204		-		-		29,204
	$	31,319	$	-	$	-	$	31,319