Statements of Changes in Stockholders' Equity (Unaudited) - 3 months ended Dec. 31, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]
Beginning balance at Sep. 30, 2017	$ 51,530	$ 14,943	$ 36,587
Beginning balance, Shares at Sep. 30, 2017		7,776,563
Net income	8,187		8,187
Dividends paid	(585)		(585)
Employee and director restricted stock vested	0	$ 0	0
Employee and director restricted stock vested, Shares		33,750
Repurchase of vested employee restricted stock for tax withholding	(117)	$ (65)	(52)
Repurchase of vested employee restricted stock for tax withholding, Shares		(7,329)
Shares issued for auto-investments pursuant to the 2015 Dividend Reinvestment and Stock Purchase Plan	0	$ 0	0
Shares issued for auto-investments pursuant to the 2015 Dividend Reinvestment and Stock Purchase Plan, Shares		16
Shares issued for dividend reinvestment pursuant to the 2015 Dividend Reinvestment and Stock Purchase Plan	9	$ 9
Shares issued for dividend reinvestment pursuant to the 2015 Dividend Reinvestment and Stock Purchase Plan, Shares		530
Stock-based compensation	598	$ 598
Ending balance at Dec. 31, 2017	$ 59,622	$ 15,485	$ 44,137
Ending balance, shares at Dec. 31, 2017		7,803,530