Organization and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2012

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Schedule of fair value measurements of investments

	As of July 31, 2012
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	8,702	$	-	$	-	$	8,702
Securities available-for-sale		4,226		-		-		4,226
	$	12,928	$	-	$	-	$	12,928

	As of April 30, 2012
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	10,848	$	-	$	-	$	10,848
Securities available-for-sale		3,881		-		-		3,881
	$	14,729	$	-	$	-	$	14,729