Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Income Taxes        
Income tax expenses (benefit)   $ 23 $ (5) $ 66
Maximum effective tax rate (as a percent) 1.00%   1.00%