Other intangible assets with definite lives (Tables)

9 Months Ended

Oct. 31, 2016

Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]

Patent amortization expense [Table Text Block]

	Three Months Ended October 31,				Nine Months Ended October 31,
	2016		2015		2016		2015
Patent amortization expense		$12		$14		$34		$40