Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	2021 Dividend Reinvestment And Stock Purchase Plan [Member]	Common Stock [Member]	Common Stock [Member] 2021 Dividend Reinvestment And Stock Purchase Plan [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2021	$ 83,262		$ 19,964		$ 63,298
Beginning balance, Shares at Sep. 30, 2021			7,469,584
Net income	1,913				1,913
Dividends paid	(1,027)				(1,027)
Repurchase of vested employee restricted stock for tax withholding			10,000
Repurchase of vested employee restricted stock for tax withholding	(37)		$ (31)		(6)
Repurchase of vested employee restricted stock for tax withholding, Shares			(3,458)
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		$ 2		$ 2
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				193
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		19		$ 19
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				1,729
Stock-based compensation	388		$ 388
Employee restricted stock forfeiture	(3)		(3)
Ending balance at Dec. 31, 2021	84,517		$ 20,339		64,178
Ending balance, shares at Dec. 31, 2021			7,478,048
Beginning balance at Sep. 30, 2022	86,298		$ 20,951		65,347
Beginning balance, Shares at Sep. 30, 2022			7,571,741
Net income	1,119				1,119
Dividends paid	(1,041)				(1,041)
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		2		$ 2
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				215
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		$ 15		$ 15
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				1,750
Stock-based compensation	262		$ 262
Ending balance at Dec. 31, 2022	$ 86,655		$ 21,230		$ 65,425
Ending balance, shares at Dec. 31, 2022			7,573,706