Stock Repurchase Program, Repurchased Shares (Details) - Common Stock - USD ($)	3 Months Ended				12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Class of Stock [Line Items]
Number of Shares (in shares)	134,068	30,680	211,296	235,628	611,672
Repurchased Amount	$ 1,862,215	$ 409,143	$ 2,717,871	$ 3,012,869	$ 8,002,098
Average Price Per Share (in dollars per share)	$ 13.89	$ 13.34	$ 12.86	$ 12.79	$ 13.08