Shareholders' Equity (Deficit): (Tables)

12 Months Ended

Dec. 31, 2016

Shareholders' Equity (Deficit):

Schedule of stock option activity

				Weighted Average
				Remaining
	Number of	Weighted Average		Contractual Life
	Shares	Exercise Price		(years)	Intrinsic Value
Outstanding at December 28, 2013	526,712	$	42.87	7.33	$	26,446,700
Granted	97,000		73.31
Exercised	(21,012)		19.89
Forfeited	(5,000)		56.85
Outstanding, December 27, 2014	597,700		48.50	6.93		20,973,700
Granted	79,400		91.46
Exercised	(8,360)		38.46
Outstanding, December 26, 2015	668,740		53.73	6.41		25,582,300
Granted	69,600		112.07
Exercised	(61,169)		26.21
Forfeited	(3,501)		80.31
Outstanding, December 31, 2016	673,670	$	62.11	6.11	$	43,139,100
Exercisable, December 31, 2016	474,762	$	49.60	5.07	$	36,345,100

Schedule of weighted average assumptions used in estimation of fair value of options granted

	Year Ended
	December 31, 2016			December 26, 2015			December 27, 2014
Risk free interest rate		1.80	%		1.71	%		1.75	%
Expected life (years)		6			6			6
Expected volatility		27.13	%		30.15	%		33.2	%
Dividend yield		1.23	%		1.36	%		1.66	%
Option fair value	$	28.54		$	24.88		$	21.02