Earnings per share (Tables)

6 Months Ended

Jul. 31, 2017

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended July 31,		Six Months Ended July 31,
	2017	2016	2017	2016
Basic weighted average common shares outstanding	7,679	7,481	7,645	7,416
Dilutive effect of equity compensation plans	—	122	—	—
Weighted average common shares outstanding assuming full dilution	7,679	7,603	7,645	7,416
Stock options not included in the computation of diluted earnings per share of common stock because the option exercise prices exceeded the average market prices of the common shares	163	356	163	378
Stock options with an exercise price below the average market price	255	248	255	226