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Shareholders' Equity: (Details 3) (Stock options, USD $)
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Stock options
   
Additional disclosures    
Shares of previously owned common stock surrendered as payment for option shares exercised 538  
Compensation expense $ 549,100 $ 437,400
Total unrecognized compensation expense $ 2,800,000  
Weighted average period for recognition of unrecognized compensation expense 2 years 8 months 12 days