XML 31 R12.htm IDEA: XBRL DOCUMENT

MARKETABLE SECURITIES

12 Months Ended

Apr. 30, 2011

Notes To Financial Statements [Abstract]

NOTE 6 . MARKETABLE SECURITIES

The amortized cost and fair value of marketable securities available-for-sale at April 30, 2011 and 2010 are as follows.

	(in thousands)
2011	Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Bank certificates of deposit		$	625		$	0		$	0		$	625
		$	625		$	0		$	0		$	625

	(in thousands)
2010	Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value

Bank certificates of deposit		$	420		$	0		$	0		$	420
		$	420		$	0		$	0		$	420

As of April 30, 2011, $275,000 of the investment in bank certificates of deposit will mature in less than one year, $50,000 will mature in May 2012 and the remaining $300,000 will mature in March 2014.

There were no realized gains or losses on sales of securities available-for-sale for the fiscal years ended April 30, 2011, 2010 and 2009. There were no other-than-temporary impairment losses incurred on the securities available-for-sale for the fiscal years ended April 30, 2011, 2010 and 2009.