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Earnings Per Share: (Details) - shares
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Earnings Per Share:        
Denominator for basic EPS - weighted average common shares 3,886,473 4,024,692 3,864,077 4,131,269
Dilutive shares associated with option plans 277,866 289,720 276,739 284,916
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares 4,164,339 4,314,412 4,140,816 4,416,185
Options excluded from EPS calculation - anti-dilutive (in shares) 6,116 10,753 15,428 16,057