Earnings per share (Tables)

6 Months Ended

Jul. 31, 2013

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,
	2013	2012	2013	2012
Basic weighted average common shares outstanding	6,985	6,923	6,958	6,919
Dilutive effect of equity incentive plans	69	—	27	—
Weighted average common shares outstanding assuming full dilution	7,054	6,923	6,985	6,919
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	375	497	375	494
Stock options with an exercise price below the average market price	574	467	574	470