Interest expense, net (Tables)

9 Months Ended

Oct. 31, 2012

Interest expense, net [Abstract]

Interest income and interest expense [Table Text Block]

	Three Months Ended October 31,						Nine Months Ended October 31,
	2012			2011			2012			2011
Interest expense		$673			$584			$1,757			$1,655
Interest income	(79		)	(189		)	(372		)	(641		)
Interest expense, net		$594			$395			$1,385			$1,014