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Shareholders' Equity (Deficit): (Tables) | 12 Months Ended
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Dec. 31, 2022
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 |  | 45,100 | ​ | ​ | 163.87 | ​ | ​ | ​ | ​ | ​
Exercised |  | (108,170) | ​ | ​ | 76.29 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (23,000) | ​ | ​ | 148.16 | ​ | ​ | ​ | ​ | ​
Outstanding, December 26, 2020 |  | 393,488 | ​ | ​ | 113.19 |  | 5.61 | ​ | ​ | 27,864,900
Granted |  | 72,600 | ​ | ​ | 226.96 | ​ | ​ | ​ | ​ | ​
Exercised |  | (105,617) | ​ | ​ | 78.78 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (4,850) | ​ | ​ | 158.48 | ​ | ​ | ​ | ​ | ​
Outstanding, December 25, 2021 |  | 355,621 | ​ | ​ | 146.03 | ​ | 6.32 | ​ | ​ | 39,320,571
Granted |  | 62,540 | ​ | ​ | 217.03 | ​ | ​ | ​ | ​ | ​
Exercised |  | (50,032) | ​ | ​ | 94.97 | ​ | ​ | ​ | ​ | ​
Forfeited |  | (6,501) | ​ | ​ | 183.28 | ​ | ​ | ​ | ​ | ​
Outstanding, December 31, 2022 |  | 361,628 | ​ | $ | 164.70 | ​ | 6.40 | ​ | $ | 26,688,183
Exercisable, December 31, 2022 |  | 217,079 | ​ | $ | 134.28 | ​ | 4.80 | ​ | $ | 22,253,550
​
Schedule of weighted average assumptions used in estimation of fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 31, 2022 | ​ | December 25, 2021 |  | December 26, 2020 |
Risk free interest rate |  | ​ | 3.15 | % | ​ | 1.13 | % | ​ | 0.45 | %
Expected life (years) |  | ​ | 6 | ​ | ​ | 6 | ​ | ​ | 6 | ​
Expected volatility |  | ​ | 27.58 | % | ​ | 25.51 | % | ​ | 25.03 | %
Dividend yield |  | ​ | 4.29 | % | ​ | 3.13 | % | ​ | 2.33 | %
Option fair value | ​ | $ | 40.59 | ​ | $ | 37.90 | ​ | $ | 28.25 | ​
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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