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Income Taxes (Details 1)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Federal tax rate 34.00% 34.00%
Increase (decrease) in taxes resulting from:    
State income taxes, net of federal tax benefit 3.40% 4.10%
Intrinsic costs warrants 0.00% 2.10%
Stock based compensation 0.40% 5.20%
Research and development tax credit (11.40%) 5.90%
Other - primarily non-deductible expenses 0.20% 1.40%
Effective tax rate 26.60% 52.70%