Earnings per share (Tables)

3 Months Ended

Apr. 30, 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 April 30,
	2013	2012
Basic weighted average common shares outstanding	6,932	6,915
Dilutive effect of deferred stock	2	—
Weighted average common shares outstanding assuming full dilution	6,934	6,915
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	486	303
Stock options with an exercise price below the average market price	469	519