Earnings (Loss) Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ (56,153,780)	$ 4,604,236	$ (1,931,334)	$ 12,735,940	$ 555,647	$ (775,093)	$ 1,070,176	$ 13,784,939	$ (40,744,938)	$ 14,635,669	$ 3,531,933
Denominator for basic and diluted earnings per share - Weighted average shares (including for 2019, 2018 and 2017, unissued, vested directors' shares of 168,586, 205,736 and 253,603, respectively)									16,743,746	16,952,664	16,900,185