v2.4.0.6
Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Jan. 01, 2011
Components of available for sale securities    
Total short term investments, Cost $ 18,154 $ 13,963
Total short term investments, Fair Market Value 17,811 13,928
Corporate bond [Member]
   
Components of available for sale securities    
Total short term investments, Cost 15,654 11,465
Total short term investments, Fair Market Value 15,309 11,424
U.S. Government bond [Member]
   
Components of available for sale securities    
Total short term investments, Cost 2,500 2,498
Total short term investments, Fair Market Value $ 2,502 $ 2,504