Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2013

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Schedule of fair value measurements of investments

		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
		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