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Earnings Per Share: (Details)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share:
Denominator for basic EPS - weighted average common shares	5,116,872	5,013,822	5,046,156	5,041,023
Dilutive shares associated with option plans	146,439	208,897	176,040	216,034
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares	5,263,311	5,222,719	5,222,196	5,257,057
Options excluded from EPS calculation - anti-dilutive (in shares)	1,267	23,270	9,403	18,863

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