Other Comprehensive Income (Loss) - components (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ 95,484,145
Balance at end of period	$ 347,196,593		347,196,593
Unrealized Net Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(34,324)	$ (34,863)	(64,433)	$ (41,196)
Unrealized gain (loss)	11,640	30,303	41,749	36,636
Other comprehensive income	11,640	30,303	41,749	36,636
Balance at end of period	(22,684)	(4,560)	(22,684)	(4,560)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(34,324)	(34,863)	(64,433)	(41,196)
Unrealized gain (loss)	11,640	30,303	41,749	36,636
Other comprehensive income	11,640	30,303	41,749	36,636
Balance at end of period	$ (22,684)	$ (4,560)	$ (22,684)	$ (4,560)