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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Oct. 31, 2011
Jan. 31, 2011
Oct. 31, 2010
Stockholders' equity:      
Preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized 3,000,000 3,000,000 3,000,000
Preferred stock, shares issued         
Preferred stock, shares outstanding         
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized 25,000,000 25,000,000 25,000,000
Common stock, shares issued 14,354,046 14,204,998 14,204,998