Other intangible assets with definite lives (Tables)

6 Months Ended

Jul. 31, 2017

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

Patent amortization expense [Table Text Block]

	Three Months Ended July 31,				Six Months Ended July 31,
	2017		2016		2017		2016
Patent amortization expense		$11		$11		$22		$22