Shareholders' Equity (Deficit): (Tables)

6 Months Ended

Jun. 27, 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	(75,329)		81.77
Forfeited	(23,000)		148.16
Outstanding, June 27, 2020	403,779	$	105.23	5.60	$	25,191,200
Exercisable, June 27, 2020	291,414	$	87.22	4.44	$	23,286,500

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

	Six Months Ended
	June 27, 2020			June 29, 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