Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 12,988,384	$ (1,160,017)	$ 30,245,918	$ 6,410,088
Reversal of net unrealized loss on securities to provision for credit loss		280,711
Unrealized gain (loss) on bond purchase commitments	8,708	256,222
Comprehensive income	8,410,947	17,377,436	11,263,492	37,824,819
Accumulated Other Comprehensive Income (Loss) [Member]
Reversal of net unrealized gains on sale of securities				(1,408,804)
Reversal of net unrealized loss on securities to provision for credit loss		280,711		652,880
Unrealized gain (loss) on securities	(4,586,145)	18,000,520	(18,951,770)	31,914,433
Unrealized gain (loss) on bond purchase commitments	8,708	256,222
Commitments [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized gain (loss) on bond purchase commitments	$ 8,708	$ 256,222	$ (30,656)	$ 256,222