Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Provision for federal income tax	$ 0
Short-term capital loss carryforwards	0	$ 0
Long-term capital loss carryforwards	0	640,000
Tax expense for taxable subsidiaries	124,000	119,000	$ 43,000
Estimated cost basis of investment for U.S. federal income tax purposes	4,006,854,000	2,517,949,000
Estimated net unrealized gain (loss)	2,119,000	10,218,000
Estimated gross unrealized gains	9,704,000	10,260,000
Estimated gross unrealized losses	$ 7,585,000	$ 42,000