Interest expense, net (Tables)

9 Months Ended

Oct. 31, 2017

Interest Income (Expense), Net [Abstract]

Interest income and interest expense [Table Text Block]

	Three Months Ended October 31,						Nine Months Ended October 31,
	2017			2016			2017			2016
Interest expense		$225			$164			$583			$556
Interest income	(32		)	(52		)	(76		)	(121		)
Interest expense, net		$193			$112			$507			$435