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Share-Based Compensation (Details Textual) (USD $)
 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Oct. 27, 2012
Jan. 31, 2012
Oct. 27, 2012
Executive Vice President [Member]
Oct. 27, 2012
Employee Stock Purchase Plan [Member]
Oct. 29, 2011
Employee Stock Purchase Plan [Member]
Oct. 27, 2012
Employee Stock Purchase Plan [Member]
Oct. 29, 2011
Employee Stock Purchase Plan [Member]
Oct. 27, 2012
Non-employee director [Member]
Oct. 27, 2012
Equity incentive plan [Member]
Oct. 27, 2012
Restricted Stock Units (RSUs) [Member]
Oct. 27, 2012
Stock Option [Member]
Apr. 28, 2012
First quarter [Member]
Apr. 30, 2011
First quarter [Member]
Jul. 28, 2012
Second quarter [Member]
Jul. 30, 2011
Second quarter [Member]
Oct. 27, 2012
Third Quarter [Member]
Oct. 29, 2011
Third Quarter [Member]
Oct. 27, 2012
First anniversary [Member]
Restricted Stock Units (RSUs) [Member]
Oct. 27, 2012
Second anniversary [Member]
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation (Textual) [Abstract]                                      
Aggregate shares authorized for awards under the Plan                 1,000,000                    
Option granted to employee vested over years                 4 years                    
Restricted stock unit vested percentage                                   50.00% 50.00%
Shares available for grant under the Plan                 460,444                    
Plan provides for an automatic annual grant                 10 years                    
Incentive stock options granted to purchase                 5,000                    
Non-employee director is entitled to an annual cash retainer               $ 7,000                      
Non-employee director is entitled to an annual cash retainer additional               500                      
Non-employee director received restricted stock award value               20,000                      
Equity retainer vested, period               12 months                      
RSAs awarded 96,900   50,000                                
Options granted weighted average fair value per share                       $ 2.09 $ 2.03 $ 2.01 $ 2.05 $ 1.93 $ 1.86    
Unrecognized compensation expense related to unvested options                   $ 599,388 $ 342,314                
Reservation of shares under stock purchase plan           247,500       50,000                  
Shares purchase under Employee Stock Purchase Plan 43,048     1,535 1,210 4,082 4,487                        
Available shares under Stock Purchase Plan 947,027 888,097   66,125   66,125                          
Share-Based Compensation (Additional Textual) [Abstract]                                      
Employee purchase plan discount rate 15.00%