Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Sep. 30, 2020	1,805,053	(424,307)
Balance at Sep. 30, 2020	$ 18,000	$ (4,000)	$ 1,755,000	$ 139,972,000	$ 141,741,000
Net income (loss)				59,270,000	59,270,000
Net (loss) income				59,270,000	59,270,000
Balance (in shares) at Dec. 31, 2020	1,805,053	(424,307)
Balance at Dec. 31, 2020	$ 18,000	$ (4,000)	1,755,000	199,242,000	201,011,000
Balance (in shares) at Sep. 30, 2020	1,805,053	(424,307)
Balance at Sep. 30, 2020	$ 18,000	$ (4,000)	1,755,000	139,972,000	141,741,000
Net income (loss)					114,319,000
Net (loss) income					114,319,000
Balance (in shares) at Jun. 30, 2021	1,805,053	(424,307)
Balance at Jun. 30, 2021	$ 18,000	$ (4,000)	1,755,000	254,291,000	256,060,000
Balance (in shares) at Dec. 31, 2020	1,805,053	(424,307)
Balance at Dec. 31, 2020	$ 18,000	$ (4,000)	1,755,000	199,242,000	201,011,000
Net income (loss)				12,476,000	12,476,000
Net (loss) income				12,476,000	12,476,000
Balance (in shares) at Mar. 31, 2021	1,805,053	(424,307)
Balance at Mar. 31, 2021	$ 18,000	$ (4,000)	1,755,000	211,718,000	213,487,000
Net income (loss)				42,573,000	42,573,000
Net (loss) income				42,573,000	42,573,000
Balance (in shares) at Jun. 30, 2021	1,805,053	(424,307)
Balance at Jun. 30, 2021	$ 18,000	$ (4,000)	1,755,000	254,291,000	256,060,000
Balance (in shares) at Sep. 30, 2021	1,805,053	(424,307)
Balance at Sep. 30, 2021	$ 18,000	$ (4,000)	1,755,000	252,872,000	254,641,000
Net income (loss)				6,878,000	6,878,000
Net (loss) income				6,878,000	6,878,000
Balance (in shares) at Dec. 31, 2021	1,805,053	(424,307)
Balance at Dec. 31, 2021	$ 18,000	$ (4,000)	1,755,000	259,750,000	261,519,000
Balance (in shares) at Sep. 30, 2021	1,805,053	(424,307)
Balance at Sep. 30, 2021	$ 18,000	$ (4,000)	1,755,000	252,872,000	254,641,000
Net income (loss)					(30,797,000)
Net (loss) income					(30,797,000)
Balance (in shares) at Jun. 30, 2022	1,805,053	(428,027)
Balance at Jun. 30, 2022	$ 18,000	$ (4,000)	1,755,000	222,075,000	223,844,000
Balance (in shares) at Dec. 31, 2021	1,805,053	(424,307)
Balance at Dec. 31, 2021	$ 18,000	$ (4,000)	1,755,000	259,750,000	261,519,000
Net income (loss)				(27,813,000)	(27,813,000)
Net (loss) income				(27,813,000)	(27,813,000)
Balance (in shares) at Mar. 31, 2022	1,805,053	(424,307)
Balance at Mar. 31, 2022	$ 18,000	$ (4,000)	1,755,000	231,937,000	233,706,000
Net income (loss)				(9,862,000)	(9,862,000)
Net (loss) income				(9,862,000)	(9,862,000)
Receipt of donated treasury stock (in shares)		(3,720)
Balance (in shares) at Jun. 30, 2022	1,805,053	(428,027)
Balance at Jun. 30, 2022	$ 18,000	$ (4,000)	$ 1,755,000	$ 222,075,000	$ 223,844,000