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Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Earnings Per Share [Abstract]        
Net income (loss) $ 6,003 $ 4,632 $ 10,276 $ 5,980
Weighted average shares outstanding 14,971 14,824 14,895 14,747
Net effect of dilutive share-based on the treasury stock method using average market price 353 230 332 187
Totals 15,324 15,054 15,227 14,934
Net income (loss) per share - basic $ 0.40 $ 0.31 $ 0.69 $ 0.41
Net income (loss) per share - diluted $ 0.39 $ 0.31 $ 0.67 $ 0.40