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Earnings per share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Earnings Per Share [Abstract]
Basic weighted average number of common shares outstanding	6,923	6,863	6,919	6,859
Weighted average number of shares outstanding assuming full dilution	6,923	6,863	6,919	6,859
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	497	311	494	241
pp	0	0	0	0
Stock options with an exercise price below the average market price	467	577	470	647

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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