Comprehensive Income (Loss) (AOCI Rollforward) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,123,255,648	$ 1,928,968,900	$ 2,065,792,821	[1]	$ 1,937,988,467
Net current-period change	(1,018,271)	(5,828,471)	900,166		(12,883,123)
Balance at end of period	2,195,949,326	1,986,574,480	2,195,949,326		1,986,574,480
Accumulated  Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(12,224,497)	(5,127,408)	(14,142,934)		1,927,244
Net current-period change	(1,018,271)	(5,828,471)	900,166		(12,883,123)
Balance at end of period	(13,242,768)	(10,955,879)	(13,242,768)		(10,955,879)
Foreign currency translation adjustments:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(4,153,406)	24,169	(4,032,239)		920,589
Other Comprehensive loss before reclassifications	(1,456,377)	(3,131,326)	(1,577,544)		(4,027,746)
Net current-period change	(1,456,377)	(3,131,326)	(1,577,544)		(4,027,746)
Balance at end of period	(5,609,783)	(3,107,157)	(5,609,783)		(3,107,157)
Unrealized (losses) gains on available-for-sale debt securities:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(8,071,091)	(5,151,577)	(10,110,695)		1,006,655
Other Comprehensive loss before reclassifications	547,342	(2,903,717)	825,060		(9,327,653)
Amounts reclassified from accumulated other comprehensive income	(109,236)	206,572	1,652,650		472,276
Net current-period change	438,106	(2,697,145)	2,477,710		(8,855,377)
Balance at end of period	$ (7,632,985)	$ (7,848,722)	$ (7,632,985)		$ (7,848,722)

[1] The condensed consolidated balance sheet at December 31, 2022 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.