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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
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

X

- 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).

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