Earnings per share (Tables)

9 Months Ended

Oct. 31, 2014

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,
	2014	2013	2014	2013
Basic weighted average common shares outstanding	7,290	7,068	7,238	6,995
Dilutive effect of equity incentive plans	—	95	99	46
Weighted average common shares outstanding assuming full dilution	7,290	7,163	7,337	7,041
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	346	216	257	362
Stock options with an exercise price below the average market price	421	665	510	519