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Shareholders' Equity (Deficit): (Details 3) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Additional disclosures        
Shares of previously owned common stock surrendered as payment for option shares exercised     587  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
BALANCE, December 27, 2014     $ 21,609,500  
BALANCE, December 27, 2014 (in shares)     4,998,512  
Repurchase of common stock     $ (74,261,500)  
Repurchase of common stock (in shares)     (875,000)  
Stock options exercised and related tax benefits     $ 175,600  
Stock options exercised and related tax benefits (in shares)     4,519  
Compensation expense relating to stock options     $ 820,400  
Cash dividends     (650,100)  
Comprehensive income $ 4,745,100 $ 4,291,500 10,828,200 $ 8,833,600
BALANCE, June 27, 2015 $ (41,477,900)   $ (41,477,900)  
BALANCE, June 27, 2015 (in shares) 4,128,031   4,128,031  
Stock options        
Additional disclosures        
Granted (in shares)     39,700  
Compensation expense     $ 820,400 $ 670,000
Total unrecognized compensation expense $ 4,000,000   $ 4,000,000  
Weighted average period for recognition of unrecognized compensation expense     2 years 7 months 6 days