AVAILABLE-FOR-SALE SECURITIES - OTTI Charges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Cumulative credit loss at beginning of period	$ (3,074,728)	$ (3,636,431)	$ 0
Additions:
Initial (increase) in credit reserves	0	(541,342)	(745,492)
Subsequent (increase) in credit reserves	0	0	0
Initial additional other-than-temporary credit impairment losses	0	(183,790)	(2,890,939)
Subsequent additional other-than-temporary credit impairment losses	0	0	0
Reductions:
For securities sold decrease in credit reserves	0	1,286,835	0
For securities sold decrease in other-than-temporary impairment	0	0	0
Cumulative credit (loss) at end of period	$ (3,074,728)	$ (3,074,728)	$ (3,636,431)