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Earnings Per Share: (Details) - shares
3 Months Ended 6 Months Ended
Jun. 25, 2022
Jun. 26, 2021
Jun. 25, 2022
Jun. 26, 2021
Earnings Per Share:        
Denominator for basic EPS - weighted average common shares 3,463,886 3,693,503 3,530,902 3,715,088
Dilutive shares associated with option plans 95,345 137,341 106,870 137,446
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,559,231 3,830,844 3,637,772 3,852,534
Options excluded from EPS calculation - anti-dilutive (in shares) 21,488 6,670 16,379 9,654