Shareholders' Equity (Deficit): (Tables)

6 Months Ended

Jun. 26, 2021

Shareholders' Equity (Deficit):

Schedule of stock option activity

				Weighted Average
				Remaining
	Number of	Weighted Average		Contractual Life
	Shares	Exercise Price		(years)		Intrinsic Value
Outstanding, December 26, 2020	393,488	$	113.19	5.61	$	27,864,900
Granted	34,000		191.82
Exercised	(14,079)		85.96
Forfeited	(2,700)		151.06
Outstanding, June 26, 2021	410,709	$	120.39	5.53	$	29,093,400
Exercisable, June 26, 2021	288,979	$	98.91	4.17	$	26,593,700

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

	Six Months Ended
	June 26, 2021			June 27, 2020
Risk free interest rate		0.90	%		0.40	%
Expected life (years)		6			6
Expected volatility		25.07	%		25.03	%
Dividend yield		2.74	%		1.92	%
Option fair value	$	32.70		$	26.55