Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010
Stockholders' equity:
Preferred stock, shares authorized	3,000,000	3,000,000	3,000,000
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, shares authorized	25,000,000	25,000,000	25,000,000
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued	14,354,046	14,204,998	14,217,198