Quarterly report pursuant to Section 13 or 15(d)

Employee Retirement Plan and Deferred Compensation Plan (Details)

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Employee Retirement Plan and Deferred Compensation Plan (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2010
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Dec. 31, 2011
Employee Retirement Plan and Deferred Compensation Plan (Textual) [Abstract]            
Employee's salary subscription rate       6.00%    
Discretionary contributions   $ 92,000 $ 56,000 $ 171,000 $ 146,000  
Deferred compensation plan assets   700,000   700,000   500,000
Deferred compensation plan associated liabilities   500,000   500,000   400,000
Change in the cash surrender value   18,000 3,000 16,000 9,000  
Eligible contributions to deferred compensation plan 50.00%          
Deferred Compensation Plan - Company matching contribution percentage maximum (at fifty cents per dollar) 2.00%          
Employee contribution associated liabilities   400,000   400,000    
Company contribution associated liabilities   $ 100,000   $ 100,000    
Contributions vest in annual installments       3 years