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Earnings Per Share: (Details) - shares
3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Denominator for basic EPS - weighted average common shares 3,520,334 3,485,852 3,510,461 3,475,066
Dilutive shares associated with option plans 150,787 167,878 152,848 152,484
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,671,121 3,653,730 3,663,309 3,627,550
Options excluded from EPS calculation - anti-dilutive (in shares) 3,413 1,317 4,267 3,492