Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2018	$ 70,980	$ 16,783	$ 54,197
Beginning balance, Shares at Sep. 30, 2018		7,897,145
Net income	3,067		3,067
Dividends declared	(871)		(871)
Employee and director restricted stock vested, Shares		21,563
Repurchase of vested employee restricted stock for tax withholding	(36)	$ (31)	(5)
Repurchase of vested employee restricted stock for tax withholding, Shares		(2,685)
Shares issued for auto-investments pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan	4	$ 4
Shares issued for auto-investments pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan, Shares		296
Shares issued for dividend reinvestment pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan	13	$ 13
Shares issued for dividend reinvestment pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan, Shares		1,207
Stock-based compensation	568	$ 568
Ending balance at Dec. 31, 2018	73,725	$ 17,337	56,388
Ending balance, shares at Dec. 31, 2018		7,917,526
Beginning balance at Sep. 30, 2019	75,528	$ 17,673	57,855
Beginning balance, Shares at Sep. 30, 2019		7,527,040
Net income	2,628		2,628
Dividends declared	(1,032)		(1,032)
Shares issued for auto-investments pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan	20	$ 20
Shares issued for auto-investments pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan, Shares		1,702
Shares issued for dividend reinvestment pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan	18	$ 18
Shares issued for dividend reinvestment pursuant to the 2018 Dividend Reinvestment and Stock Purchase Plan, Shares		1,596
Shares repurchased pursuant to a stock buyback program	(685)	$ (128)	(557)
Shares repurchased pursuant to a stock buyback program, Shares		(64,787)
Stock-based compensation	447	$ 447
Ending balance at Dec. 31, 2019	$ 76,924	$ 18,030	$ 58,894
Ending balance, shares at Dec. 31, 2019		7,465,551