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Earnings Per Share: (Details) - shares
3 Months Ended 9 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Earnings Per Share:        
Denominator for basic EPS - weighted average common shares 3,635,055 3,730,490 3,688,419 3,710,112
Dilutive shares associated with option plans 147,818 127,212 140,903 147,642
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,782,873 3,857,702 3,829,322 3,857,754
Options excluded from EPS calculation - anti-dilutive (in shares) 3,038 11,979 6,833 11,057