Interest expense, net (Tables)

9 Months Ended

Oct. 31, 2016

Interest Income (Expense), Net [Abstract]

Interest income and interest expense [Table Text Block]

	Three Months Ended October 31,						Nine Months Ended October 31,
	2016			2015			2016			2015
Interest expense		$164			$247			$556			$615
Interest income	(52		)	(120		)	(121		)	(405		)
Interest expense, net		$112			$127			$435			$210