Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Sep. 30, 2018			1,805,053	(424,307)
Balance at Sep. 30, 2018	$ 115,786,000	$ (115,786,000)	$ 18,000	$ (4,000)	$ 1,755,000	$ 45,361,000	$ 115,786,000	$ 162,916,000
Net (loss) income						(21,533,000)		(21,533,000)
Balance (in shares) at Dec. 31, 2018			1,805,053	(424,307)
Balance at Dec. 31, 2018			$ 18,000	$ (4,000)	1,755,000	139,614,000		141,383,000
Balance (in shares) at Sep. 30, 2018			1,805,053	(424,307)
Balance at Sep. 30, 2018	$ 115,786,000	$ (115,786,000)	$ 18,000	$ (4,000)	1,755,000	45,361,000	$ 115,786,000	162,916,000
Net (loss) income								(12,692,000)
Balance (in shares) at Jun. 30, 2019			1,805,053	(424,307)
Balance at Jun. 30, 2019			$ 18,000	$ (4,000)	1,755,000	148,455,000		150,224,000
Balance (in shares) at Dec. 31, 2018			1,805,053	(424,307)
Balance at Dec. 31, 2018			$ 18,000	$ (4,000)	1,755,000	139,614,000		141,383,000
Net (loss) income						5,018,000		5,018,000
Balance (in shares) at Mar. 31, 2019			1,805,053	(424,307)
Balance at Mar. 31, 2019			$ 18,000	$ (4,000)	1,755,000	144,632,000		146,401,000
Net (loss) income						3,823,000		3,823,000
Balance (in shares) at Jun. 30, 2019			1,805,053	(424,307)
Balance at Jun. 30, 2019			$ 18,000	$ (4,000)	1,755,000	148,455,000		150,224,000
Balance (in shares) at Sep. 30, 2019			1,805,053	(424,307)
Balance at Sep. 30, 2019			$ 18,000	$ (4,000)	1,755,000	135,931,000		137,700,000
Net (loss) income						14,210,000		14,210,000
Balance (in shares) at Dec. 31, 2019			1,805,053	(424,307)
Balance at Dec. 31, 2019			$ 18,000	$ (4,000)	1,755,000	150,141,000		151,910,000
Balance (in shares) at Sep. 30, 2019			1,805,053	(424,307)
Balance at Sep. 30, 2019			$ 18,000	$ (4,000)	1,755,000	135,931,000		137,700,000
Net (loss) income								(27,842,000)
Balance (in shares) at Jun. 30, 2020			1,805,053	(424,307)
Balance at Jun. 30, 2020			$ 18,000	$ (4,000)	1,755,000	108,089,000		109,858,000
Balance (in shares) at Dec. 31, 2019			1,805,053	(424,307)
Balance at Dec. 31, 2019			$ 18,000	$ (4,000)	1,755,000	150,141,000		151,910,000
Net (loss) income						(56,326,000)		(56,326,000)
Balance (in shares) at Mar. 31, 2020			1,805,053	(424,307)
Balance at Mar. 31, 2020			$ 18,000	$ (4,000)	1,755,000	93,815,000		95,584,000
Net (loss) income						14,274,000		14,274,000
Balance (in shares) at Jun. 30, 2020			1,805,053	(424,307)
Balance at Jun. 30, 2020			$ 18,000	$ (4,000)	$ 1,755,000	$ 108,089,000		$ 109,858,000