Comprehensive Income (AOCI Rollforward) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021	Dec. 31, 2021	[1]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,986,574,480	$ 1,916,318,989	$ 1,937,988,467	[1]	$ 1,963,943,128
Net current-period change	14,241,836	(994,438)	1,358,713		(3,580,452)
Balance at end of period	2,034,045,664	1,887,630,286	2,034,045,664		1,887,630,286
Accumulated other comprehensive (loss) income, end of period	3,285,957		3,285,957			$ 1,927,244
Accumulated  Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(10,955,879)	4,265,038	1,927,244		6,851,052
Net current-period change	14,241,836	(994,438)	1,358,713		(3,580,452)
Balance at end of period	3,285,957	3,270,600	3,285,957		3,270,600
Accumulated other comprehensive (loss) income, end of period	3,285,957	3,270,600	3,285,957		3,270,600
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(3,107,157)	879,832	920,589		769,045
Other Comprehensive (loss) income before reclassifications	17,751,603	(349,165)	13,723,857		(238,378)
Net current-period change	17,751,603	(349,165)	13,723,857		(238,378)
Balance at end of period	14,644,446	530,667	14,644,446		530,667
Unrealized gains on available-for-sale debt securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(7,848,722)	3,385,206	1,006,655		6,082,007
Other Comprehensive (loss) income before reclassifications	(3,714,578)	(645,273)	(13,042,231)		(2,727,750)
Amounts reclassified from accumulated other comprehensive income	204,811	0	677,087		(614,324)
Net current-period change	(3,509,767)	(645,273)	(12,365,144)		(3,342,074)
Balance at end of period	$ (11,358,489)	$ 2,739,933	$ (11,358,489)		$ 2,739,933

[1] The condensed consolidated balance sheet at December 31, 2021 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.