Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 1,039,134	$ 1,260,758	$ 3,470,433	$ (2,238,392)	$ 737,190	$ (786,795)	$ (7,438,161)	$ (2,799,118)	$ 3,531,933	$ (10,286,884)	$ 9,321,341
Denominator for basic and diluted earnings per share - Weighted average shares (including for 2017, 2016 and 2015, unissued, vested directors' shares of 253,603, 263,057 and 246,442, respectively)									16,900,185	16,840,856	16,768,904