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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, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Net Income (Loss) per Share
Net income (loss)	$ 6,210	$ 7,053	$ 1,763	$ 2,220
Average shares outstanding	14,570	14,369	14,506	14,333
Net effect of dilutive stock options based on the treasury stock method using average market price	77	26	85	25
Totals	14,647	14,395	14,591	14,358
Net income (loss) per share - basic	$ 0.43	$ 0.49	$ 0.12	$ 0.15
Net income (loss) per share - diluted	$ 0.42	$ 0.49	$ 0.12	$ 0.15

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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