Interest expense, net

6 Months Ended

Jul. 31, 2011

Interest Expense, Net [Abstract]

Interest Income and Interest Expense Disclosure [Text Block]

Interest expense, net.

	Three Months Ended July 31,						Six Months Ended July 31,
	2011			2010			2011			2010
Interest expense		$551			$523			$1,071			$918
Interest income	(219		)	(119		)	(452		)	(229		)
Interest expense, net		$332			$404			$619			$689