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Earnings Per Share: (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Earnings Per Share:
Denominator for basic EPS - weighted average common shares	5,056,289	4,980,844	5,054,620	4,985,220
Dilutive shares associated with option plans	211,956	258,599	219,603	242,248
Denominator for diluted EPS - weighted average common shares and dilutive potential common shares	5,268,245	5,239,443	5,274,223	5,227,468
Options excluded from EPS calculation - anti-dilutive (in shares)	25,554	11,459	17,110	20,006

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