Earnings per share (Tables)

9 Months Ended

Oct. 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 October 31,		Nine Months Ended October 31,
	2017	2016	2017	2016
Basic weighted average common shares outstanding	7,714	7,541	7,668	7,457
Dilutive effect of equity compensation plans	—	—	—	—
Weighted average common shares outstanding assuming full dilution	7,714	7,541	7,668	7,457
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	143	270	143	336
Stock options with an exercise price below the average market price	226	304	226	238