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Earnings Per Share: (Details) - shares
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Earnings Per Share:    
Denominator for basic EPS - weighted average common shares 3,906,895 3,847,312
Dilutive shares associated with option plans 291,559 277,261
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 4,198,454 4,124,573
Options excluded from EPS calculation - anti-dilutive (in shares) 5,280 15,929