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Shareholders' Equity: (Details 3) (Stock options, USD $)
9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Stock options
   
Additional disclosures    
Shares of previously owned common stock surrendered as payment for option shares exercised 538  
Compensation expense $ 842,900 $ 683,000
Total unrecognized compensation expense $ 2,500,000  
Weighted average period for recognition of unrecognized compensation expense 2 years 4 months 14 days