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Net Income (Loss) per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income (loss) $ (3,855) $ 3,408 $ 6,210 $ (4,447)
Average shares outstanding 14,718,000 [1]     14,441,000 [1]
Net effect of dilutive stock options based on the treasury stock method using average market price 0     0
Totals 14,718,000     14,441,000
Earnings Per Share, Basic $ (0.26) [2]     $ (0.31) [2]
Earnings Per Share, Diluted $ (0.26) [2]     $ (0.31) [2]
Stock Option [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, Amount 266,000     203,000
[1] Certain exercisable and non-exercisable stock options were not included in the computation of diluted net loss per share at April 30, 2014 and 2013, because their inclusion would have been anti-dilutive. The number of stock options outstanding, which met this anti-dilutive criterion for the three months ended April 30, 2014 and 2013, was 266,000 and 203,000, respectively.
[2] Net loss per share was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.