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Shareholders' Equity: (Details 3) (Stock options, USD $)
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Stock options
   
Additional disclosures    
Compensation expense $ 261,700 $ 205,400
Total unrecognized compensation expense $ 2,400,000  
Weighted average period for recognition of unrecognized compensation expense 2 years 6 months