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

3 Months Ended

Jul. 31, 2016

Notes Tables

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

	As of July 31, 2016
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	19,846	$	-	$	-	$	19,846
Securities available-for-sale		3,875		-		-		3,875
	$	23,721	$	-	$	-	$	23,721

	As of April 30, 2016
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	12,037	$	-	$	-	$	12,037
Securities available-for-sale		3,637		-		-		3,637
	$	15,674	$	-	$	-	$	15,674