Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Two Thousand Eighteen Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock [Member]	Two Thousand Eighteen Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock Including Additional Paid in Capital [Member]	Two Thousand Eighteen Dividend Reinvestment and Stock Purchase Plan [Member] Retained Earnings [Member]	Two Thousand Eighteen Dividend Reinvestment and Stock Purchase Plan [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock Including Additional Paid in Capital [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Retained Earnings [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member]	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Sep. 30, 2022									7,571,741
Balance at Sep. 30, 2022										$ 20,951	$ 65,347	$ 86,298
Net income										0	1,119	1,119
Dividends paid										0	(1,041)	(1,041)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	215
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 2	$ 0	$ 2
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,750
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		15	0	15
Stock-based compensation										262	0	262
Balance (in shares) at Dec. 31, 2022									7,573,706
Balance at Dec. 31, 2022										21,230	65,425	86,655
Balance (in shares) at Sep. 30, 2022									7,571,741
Balance at Sep. 30, 2022										20,951	65,347	86,298
Net income												2,314
Balance (in shares) at Mar. 31, 2023									7,575,857
Balance at Mar. 31, 2023										21,510	65,579	87,089
Balance (in shares) at Dec. 31, 2022									7,573,706
Balance at Dec. 31, 2022										21,230	65,425	86,655
Net income										0	1,195	1,195
Dividends paid										0	(1,041)	(1,041)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	199
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		2	0	2
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,952
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		16	0	16
Stock-based compensation										262	0	262
Balance (in shares) at Mar. 31, 2023									7,575,857
Balance at Mar. 31, 2023										21,510	65,579	87,089
Balance (in shares) at Sep. 30, 2023									7,671,099
Balance at Sep. 30, 2023										21,800	65,952	87,752
Net income										0	1,200	1,200
Dividends paid										0	(1,055)	(1,055)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	145
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		1	0	1
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	2,625
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		17	0	17
Stock-based compensation										246	0	246
Balance (in shares) at Dec. 31, 2023									7,673,869
Balance at Dec. 31, 2023										22,064	66,097	88,161
Balance (in shares) at Sep. 30, 2023									7,671,099
Balance at Sep. 30, 2023										21,800	65,952	87,752
Net income												2,740
Balance (in shares) at Mar. 31, 2024									7,678,215
Balance at Mar. 31, 2024										22,340	66,582	88,922
Balance (in shares) at Dec. 31, 2023									7,673,869
Balance at Dec. 31, 2023										22,064	66,097	88,161
Net income										0	1,540	1,540
Dividends paid										0	(1,055)	(1,055)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,100				669
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 8	$ 0	$ 8		$ 5	$ 0	$ 5
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)					2,577
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan						$ 17	$ 0	$ 17
Stock-based compensation										246	0	246
Balance (in shares) at Mar. 31, 2024									7,678,215
Balance at Mar. 31, 2024										$ 22,340	$ 66,582	$ 88,922