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FAIR VALUE (Tables) | 12 Months Ended
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Dec. 31, 2022
Assets measured at fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 25, 2021
​ | ​ | Quoted | ​ | Prices with | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Quoted | ​ | Prices with | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Prices in | ​ | Other | ​ | ​ | Prices with | ​ | ​ | ​ | ​ | Prices in | ​ | Other | ​ | ​ | Prices with | ​ | ​ | ​
​ | ​ | Active | ​ | Observable | ​ | ​ | Unobservable | ​ | ​ | ​ | ​ | Active | ​ | Observable | ​ | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Markets | ​ | Inputs | ​ | ​ | Inputs | ​ | ​ | ​ | ​ | Markets | ​ | Inputs | ​ | ​ | Inputs | ​ | ​ | ​
​ |  | (Level 1) |  | (Level 2) |  | ​ | (Level 3) | ​ | Total |  | (Level 1) |  | (Level 2) |  | ​ | (Level 3) |  | Total
Money market funds | ​ | $ | 390,219 |  | $ | 1,286 | ​ | $ | — |  | $ | 391,505 |  | $ | 19 |  | $ | 9,392 | ​ | $ | — |  | $ | 9,411
Fixed income funds | ​ |  | 2,594 | ​ |  | 16,692 | ​ | ​ | — |  |  | 19,286 | ​ |  | 1,668 | ​ |  | 16,910 | ​ | ​ | — |  |  | 18,578
Treasury securities | ​ | ​ | 343 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 343 | ​ | ​ | 342 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 342
Equity securities | ​ |  | 17,337 | ​ |  | — | ​ | ​ | — |  |  | 17,337 | ​ |  | 20,163 | ​ |  | — | ​ | ​ | — |  |  | 20,163
Alternative investments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,102 | ​ | ​ | 4,102 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,785 | ​ | ​ | 3,785
Mutual funds: | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Domestic stock funds | ​ |  | 13,067 | ​ |  | — | ​ | ​ | — |  |  | 13,067 | ​ |  | 10,910 | ​ |  | — | ​ | ​ | — |  |  | 10,910
International stock funds | ​ |  | 1,414 | ​ |  | — | ​ | ​ | — |  |  | 1,414 | ​ |  | 1,687 | ​ |  | — | ​ | ​ | — |  |  | 1,687
Target funds | ​ |  | 8 | ​ |  | — | ​ | ​ | — |  |  | 8 | ​ |  | 23 | ​ |  | — | ​ | ​ | — |  |  | 23
Bond funds | ​ |  | 130 | ​ |  | — | ​ | ​ | — |  |  | 130 | ​ |  | 146 | ​ |  | — | ​ | ​ | — |  |  | 146
Alternative funds | ​ | ​ | 474 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 474 | ​ | ​ | 483 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 483
Total mutual funds | ​ |  | 15,093 | ​ |  | — | ​ | ​ | — |  |  | 15,093 | ​ |  | 13,249 | ​ |  | — | ​ | ​ | — |  |  | 13,249
Total | ​ | $ | 425,586 | ​ | $ | 17,978 | ​ | $ | 4,102 | ​ | $ | 447,666 | ​ | $ | 35,441 | ​ | $ | 26,302 | ​ | $ | 3,785 | ​ | $ | 65,528
​
Available for sale investment portfolio | Ardellis’ available for sale investment portfolio, including funds held with the State of Michigan, consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 25, 2021
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​
​ |  | Cost |  | Gain (Loss) |  | Fair Value |  | Cost |  | Gain |  | Fair Value
Fixed Income | ​ | $ | 21,399 |  | $ | (2,113) |  | $ | 19,286 | ​ | $ | 18,169 |  | $ | 409 |  | $ | 18,578
Treasury Securities | ​ | ​ | 343 | ​ | ​ | — | ​ | ​ | 343 | ​ | ​ | 342 | ​ | ​ | — | ​ | ​ | 342
Equity | ​ |  | 15,762 | ​ | ​ | 1,575 |  |  | 17,337 | ​ |  | 15,196 | ​ |  | 4,967 |  |  | 20,163
Mutual Funds | ​ | ​ | 13,430 | ​ | ​ | 1,144 |  | ​ | 14,574 | ​ | ​ | 9,222 | ​ | ​ | 3,325 |  | ​ | 12,547
Alternative Investments | ​ | ​ | 3,105 | ​ | ​ | 997 |  | ​ | 4,102 | ​ | ​ | 3,003 | ​ | ​ | 782 |  | ​ | 3,785
Total | ​ | $ | 54,039 | ​ | $ | 1,603 |  | $ | 55,642 | ​ | $ | 45,932 | ​ | $ | 9,483 |  | $ | 55,415
​

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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