Investments - Cost and Estimated Fair Value of Equity Securities (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Investments [Abstract]
Cost	$ 27,238,000	$ 24,726,000
Gross gains	13,820,000	12,087,000
Gross losses	51,000	5,000
Estimated fair value	$ 41,007,179	$ 36,807,810