Net Income (Loss) per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 4,632	$ 3,408	$ 5,980	$ 5,171
Average shares outstanding	14,824	14,647	14,747	14,582
Net effect of dilutive stock options based on the treasury stock method using average market price	230	143	187	130
Totals	15,054	14,790	14,934	14,712
Earnings Per Share, Basic	$ 0.31	$ 0.23	$ 0.41	$ 0.35
Earnings Per Share, Diluted	$ 0.31	$ 0.23	$ 0.40	$ 0.35