Organization and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2013

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Schedule of fair value measurements of investments

	As of July 31, 2013
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	3,758	$	-	$	-	$	3,758
Securities available-for-sale		7,903		-		-		7,903
	$	11,661	$	-	$	-	$	11,661
	As of April 30, 2013
($ in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	6,312	$	-	$	-	$	6,312
Securities available-for-sale		6,682		-		-		6,682
	$	12,994	$	-	$	-	$	12,994