Interest expense, net (Tables)

6 Months Ended

Jul. 31, 2013

Interest expense, net [Abstract]

Interest income and interest expense [Table Text Block]

	Three Months Ended July 31,						Six Months Ended July 31,
	2013			2012			2013			2012
Interest expense		$518			$518			$1,062			$953
Interest income	(115		)	(165		)	(222		)	(295		)
Interest expense, net		$403			$353			$840			$658