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Marketable Securities (Tables)

6 Months Ended

Nov. 30, 2012

Marketable Securities [Abstract]

Marketable securities

		Amortized cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(in thousands)
Available-for-sales securities
U.S. government agency obligations		$	1,850			$	—			$	—			$	1,850
Corporate bond securities			304				1				—				305
		$	2,154			$	1			$	—			$	2,155

Marketable securities as of May 31, 2012 consisted of the following:

		Amortized cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(in thousands)
Available-for-sales securities
U.S. government agency obligations		$	7,739			$	5			$	(45	)		$	7,699
Corporate bond securities			6,516				10				(155	)			6,371
		$	14,255			$	15			$	(200	)		$	14,070

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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