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Shareholders' Equity: (Details 3) (Stock options, USD $)
9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Stock options
   
Additional disclosures    
Compensation expense $ 1,037,200 $ 842,900
Total unrecognized compensation expense $ 3,200,000  
Weighted average period for recognition of unrecognized compensation expense 2 years 4 months 24 days