Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2015

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Schedule of fair value measurements of investments

	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
	As of April 30, 2014
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	5,482	$	-	$	-	$	5,482
Securities available-for-sale		9,226		-		-		9,226
	$	14,708	$	-	$	-	$	14,708