Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 30,492,151	$ 41,139,529
Unrealized loss on bond purchase commitments		(3,002,540)
Comprehensive income	70,822,786	24,493,741
Accumulated Other Comprehensive Income (Loss) [Member]
Net income	30,492,151	41,139,529
Reversal of net unrealized losses on securities with other-than-temporary impairment		525,446
Unrealized gain (loss) on securities	$ 40,330,635	(14,168,694)
Unrealized loss on bond purchase commitments		(3,002,540)
Commitments [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized loss on bond purchase commitments		$ (3,002,540)