Summary of Significant Accounting Policies (Accumulated Other Comprehensive Earnings (Loss)) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net current period other comprehensive loss	$ 1,080,987	$ 3,524,729	$ (1,145,535)	$ 1,813,883
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			5,520,091	2,953,936
Other comprehensive loss before reclassification			(1,137,734)	2,086,077
Amount reclassified from accumulated other comprehensive loss			(7,801)	(272,194)
Net current period other comprehensive loss			(1,145,535)	1,813,883
Balance	$ 4,374,556	$ 4,767,819	$ 4,374,556	$ 4,767,819