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Earnings Per Share: (Details) - shares
3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Earnings Per Share:        
Denominator for basic EPS - weighted average common shares 3,478,628 3,463,886 3,469,675 3,530,902
Dilutive shares associated with option plans 156,060 95,345 144,787 106,870
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,634,688 3,559,231 3,614,462 3,637,772
Options excluded from EPS calculation - anti-dilutive (in shares) 2,836 21,488 4,977 16,379