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Earnings Per Share: (Details) - shares
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Earnings Per Share:    
Denominator for basic EPS - weighted average common shares 3,711,597 3,906,895
Dilutive shares associated with option plans 200,154 291,559
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 3,911,751 4,198,454
Options excluded from EPS calculation - anti-dilutive (in shares) 2,192 5,280