Other intangible assets with definite lives (Tables)

9 Months Ended

Oct. 31, 2017

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

Patent amortization expense [Table Text Block]

	Three Months Ended October 31,				Nine Months Ended October 31,
	2017		2016		2017		2016
Patent amortization expense		$12		$12		$34		$34