Other intangible assets with definite lives (Tables)

6 Months Ended

Jul. 31, 2016

Other intangible assets with definite lives [Abstract]

Patent amortization expense [Table Text Block]

	Three Months Ended July 31,				Six Months Ended July 31,
	2016		2015		2016		2015
Patent amortization expense		$11		$13		$22		$26