Consolidated Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss)	$ (7,989,955)	$ 450,479	$ 3,313,786
Other comprehensive income (loss):
Increase (decrease) in net unrealized gain on available-for-sale securities, net	(3,824,461)	(14,776,266)	10,845,303
Reclassification adjustment for net gain (loss) included in net income (loss)	(5,589,740)	1,969,108	7,458,001
Reclassification adjustment for other-than-temporary impairments included in net income (loss)	541,342	745,492	0
Reclassification cumulative adjustment for Linked Transactions	0	4,457,544	0
Total other comprehensive income (loss)	(8,872,859)	(7,604,122)	18,303,304
Less: Dividends to preferred stockholders	(3,522,036)	(3,522,036)	(2,887,296)
Comprehensive income (loss) attributable to common stockholders	$ (20,384,850)	$ (10,675,679)	$ 18,729,794