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Investments in Securities - Schedule of Marketable Securities at Cost and Fair Value (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | $ 65,597,000 | $ 71,299,000
Gross Unrealized Gains |  | 295,000 | 335,000
Gross Unrealized Losses |  | (351,000) | (404,000)
Fair Value | $ 0 | 65,541,000 | 71,230,000
U.S. Treasury bills |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 55,009,000 | 60,801,000
Gross Unrealized Gains |  | 190,000 | 131,000
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 55,199,000 | 60,932,000
Municipal bonds |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 9,631,000 | 9,543,000
Gross Unrealized Gains |  | 38,000 | 148,000
Gross Unrealized Losses |  | (351,000) | (404,000)
Fair Value |  | 9,318,000 | 9,287,000
Corporate/government bonds |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 479,000 | 477,000
Gross Unrealized Gains |  | 33,000 | 29,000
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | 512,000 | 506,000
Other bonds |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost |  | 478,000 | 478,000
Gross Unrealized Gains |  | 34,000 | 27,000
Gross Unrealized Losses |  | 0 | 0
Fair Value |  | $ 512,000 | $ 505,000

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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