Shareholders' Equity (Deficit): (Tables)

9 Months Ended

Sep. 26, 2020

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 28, 2019	479,558	$	101.78	5.79	$	45,283,200
Granted	22,550		143.87
Exercised	(87,579)		80.77
Forfeited	(23,000)		148.16
Outstanding, September 26, 2020	391,529	$	106.18	5.41	$	23,296,200
Exercisable, September 26, 2020	279,164	$	87.77	4.22	$	21,578,700

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

	Nine Months Ended
	September 26, 2020			September 28, 2019
Risk free interest rate		0.40	%		1.98	%
Expected life (years)		6			6
Expected volatility		25.03	%		20.30	%
Dividend yield		1.92	%		1.26	%
Option fair value	$	26.55		$	32.65