Statements of Changes in Stockholders' Equity - 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	4,771	4,771
Dividends paid										0	(4,166)	(4,166)
Employee and director restricted stock vested (in shares)									124,015
Employee and director restricted stock vested										0	0	0
Repurchase of vested employee restricted stock for tax withholding (in shares)									(34,192)
Repurchase of vested employee restricted stock for tax withholding										(233)	0	(233)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,206
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 9	$ 0	$ 9
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	8,329
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		64	0	64
Stock-based compensation										1,026	0	1,026
Employee restricted stock forfeiture										(17)	0	(17)
Balance (in shares) at Sep. 30, 2023									7,671,099
Balance at Sep. 30, 2023										21,800	65,952	87,752
Net income										0	7,097	7,097
Dividends paid										0	(4,222)	(4,222)
Employee and director restricted stock vested (in shares)									133,744
Employee and director restricted stock vested										0	0	0
Repurchase of vested employee restricted stock for tax withholding (in shares)									(39,410)
Repurchase of vested employee restricted stock for tax withholding										(295)	(108)	(403)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,245				2,243
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 8	$ 0	$ 8		$ 19	$ 0	$ 19
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)					2,625				6,789
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan						$ 17	$ 0	$ 17		53	0	53
Stock-based compensation										990	0	990
Balance (in shares) at Sep. 30, 2024									7,778,335
Balance at Sep. 30, 2024										$ 22,592	$ 68,719	$ 91,311