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				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, 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				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