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]	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Total
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 2024 Dividend Reinvestment and Stock Purchase Plan (in shares)	145
Shares issued for auto-investments pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan		$ 1	$ 0	$ 1
Shares issued for dividend reinvestment pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan (in shares)	2,625
Shares issued for dividend reinvestment pursuant to the 2024 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, 2024					7,778,335
Balance at Sep. 30, 2024						22,592	68,719	91,311
Net income						0	2,834	2,834
Dividends paid						0	(1,070)	(1,070)
Employee and director restricted stock vested (in shares)					3,294
Employee and director restricted stock vested						0	0	0
Repurchase of vested employee restricted stock for tax withholding (in shares)					(1)
Repurchase of vested employee restricted stock for tax withholding						0	0	0
Shares issued for auto-investments pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan (in shares)	213
Shares issued for auto-investments pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan		2	0	2
Shares issued for dividend reinvestment pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,771
Shares issued for dividend reinvestment pursuant to the 2024 Dividend Reinvestment and Stock Purchase Plan		$ 18	$ 0	$ 18
Stock-based compensation						299	0	299
Balance (in shares) at Dec. 31, 2024					7,783,612
Balance at Dec. 31, 2024						$ 22,911	$ 70,483	$ 93,394