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Net Income (Loss) per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Net Income (Loss) per Share        
Net income (loss) $ 7,053 $ 2,732 $ 2,220 $ (2,668)
Average shares outstanding 14,369 14,274 14,333 14,240
Net effect of dilutive stock options based on the treasury stock method using average market price 26 18 25 0
Totals 14,395 14,292 14,358 14,240
Net income (loss) per share - basic $ 0.49 $ 0.19 $ 0.15 [1] $ (0.19) [1]
Net income (loss) per share - diluted $ 0.49 $ 0.19 $ 0.15 [1] $ (0.19) [1]
[1] (a) Net income per share for the six months ended July 31, 2012 was calculated based on diluted shares outstanding. Net loss pershare for the six months ended July 31, 2011 was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.