Earnings per share (Tables)

3 Months Ended

Apr. 30, 2018

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 April 30,
	2018	2017
Basic weighted average common shares outstanding	7,718	7,610
Dilutive effect of equity compensation plans	—	—
Weighted average common shares outstanding assuming full dilution	7,718	7,610
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	137	229
Stock options with an exercise price below the average market price	212	263