Shareholders' Equity (Deficit): (Tables)

6 Months Ended

Jun. 30, 2018

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 30, 2017	658,184	$	72.33	5.87	$	37,723,800
Granted	35,000		143.20
Exercised	(27,697)		41.39
Forfeited	(4,063)		113.95
Outstanding, June 30, 2018	661,424	$	77.12	5.69	$	47,178,100
Exercisable, June 30, 2018	487,335	$	62.07	4.66	$	42,095,400

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

	Six Months Ended
	June 30, 2018			July 1, 2017
Risk free interest rate		2.73	%		1.90	%
Expected life (years)		6			6
Expected volatility		20.40	%		26.93	%
Dividend yield		1.17	%		1.14	%
Option fair value	$	31.44		$	31.38