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)
Employee restricted stock vested	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, 2021	83,262		$ 19,964		63,298
Beginning balance, Shares at Sep. 30, 2021			7,469,584
Net income	3,515
Ending balance at Mar. 31, 2022	85,394		$ 20,642		64,752
Ending balance, shares at Mar. 31, 2022			7,480,064
Beginning balance at Dec. 31, 2021	84,517		$ 20,339		64,178
Beginning balance, Shares at Dec. 31, 2021			7,478,048
Net income	1,602				1,602
Dividends paid	(1,028)				(1,028)
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		1		$ 1
Shares issued for auto-investments pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				64
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				1,952
Stock-based compensation	295		$ 295
Employee restricted stock forfeiture	(12)		(12)
Ending balance at Mar. 31, 2022	85,394		$ 20,642		64,752
Ending balance, shares at Mar. 31, 2022			7,480,064
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
Beginning balance at Sep. 30, 2022	86,298		$ 20,951		65,347
Beginning balance, Shares at Sep. 30, 2022			7,571,741
Net income	2,314
Ending balance at Mar. 31, 2023	87,089		$ 21,510		65,579
Ending balance, shares at Mar. 31, 2023			7,575,829
Beginning balance at Dec. 31, 2022	86,655		$ 21,230		65,425
Beginning balance, Shares at Dec. 31, 2022			7,573,706
Net income	1,195				1,195
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				199
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan		$ 16		$ 16
Shares issued for dividend reinvestment pursuant to the 2018(2021) Dividend Reinvestment and Stock Purchase Plan, Shares				1,924
Stock-based compensation	262		$ 262
Ending balance at Mar. 31, 2023	$ 87,089		$ 21,510		$ 65,579
Ending balance, shares at Mar. 31, 2023			7,575,829