Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Beginning balance, value at Sep. 30, 2020	$ 338	$ 38,670	$ 5,935	$ 105	$ 45,048
Common Stock, Shares, Outstanding, Beginning Balance at Sep. 30, 2020	3,377,279
Stock-based compensation	$ 0	59	0	0	59
Cash dividends paid ($3.75 per share)	0	0	(10,132)	0	(10,132)
Net income	0	0	(222)	0	(222)
Ending balance, value at Dec. 31, 2020	$ 338	38,729	(4,419)	105	34,753
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2020	3,377,279
Beginning balance, value at Sep. 30, 2021	$ 342	39,257	(3,572)	89	$ 36,116
Common Stock, Shares, Outstanding, Beginning Balance at Sep. 30, 2021	3,415,643				3,415,643
Stock-based compensation	$ 0	57	0	0	$ 57
Exercise of stock options	$ 1	111	0	0	112
Exercise of stock options	16,253
Cash dividends paid ($3.75 per share)	$ 0	0	(12,808)	0	(12,808)
Net income	0	0	6,439	0	6,439
Ending balance, value at Dec. 31, 2021	$ 343	$ 39,425	$ (9,941)	$ 89	$ 29,916
Common Stock, Shares, Outstanding, Ending Balance at Dec. 31, 2021	3,431,896				3,431,896