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Earnings Per Share: (Details) - shares
3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Earnings Per Share:    
Denominator for basic EPS - weighted average common shares 3,538,647 3,497,261
Dilutive shares associated with option plans 134,296 164,106
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,672,943 3,661,367
Options excluded from EPS calculation - anti-dilutive (in shares) 8,382 1,667