Organization and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jan. 31, 2016

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Schedule of levels of fair value measurements of investments

	As of January 31, 2016
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	9,641	$	-	$	-	$	9,641
Securities available-for-sale		4,550		-		-		4,550
	$	14,191	$	-	$	-	$	14,191

	As of April 30, 2015
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	5,272	$	-	$	-	$	5,272
Securities available-for-sale		9,632		-		-		9,632
	$	14,904	$	-	$	-	$	14,904