Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total		Stock Options	Number of Shares	Number of Shares Stock Options	Unearned Shares Issued to ESOP	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Sep. 30, 2016				6,943,868
Balance at beginning of period at Sep. 30, 2016	$ 96,834			$ 9,961		$ (661)	$ 87,709	$ (175)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,147						3,147
Other comprehensive income (loss)	$ (14)							(14)
Exercise of stock options (in shares)	12,700			12,700
Exercise of stock options	$ 80			$ 80
Common stock dividends ($0.09 and $0.11 per share, respectively)	(626)						(626)
Earned ESOP shares, net of income taxes	128			$ 62		66
Stock option compensation expense			$ 85		$ 85
Balance at end of period (in shares) at Dec. 31, 2016				6,956,568
Balance at end of period at Dec. 31, 2016	99,634			$ 10,188		(595)	90,230	(189)	[1]
Balance at beginning of period (in shares) at Sep. 30, 2017				7,361,077
Balance at beginning of period at Sep. 30, 2017	111,000	[2]		$ 13,286		(397)	98,235	(124)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,614						3,614
Other comprehensive income (loss)	$ (12)							(12)
Exercise of stock options (in shares)	6,250			6,250
Exercise of stock options	$ 61			$ 61
Common stock dividends ($0.09 and $0.11 per share, respectively)	(810)						(810)
Earned ESOP shares, net of income taxes	215			$ 149		66
Stock option compensation expense			$ 44		$ 44
Balance at end of period (in shares) at Dec. 31, 2017				7,367,327
Balance at end of period at Dec. 31, 2017	$ 114,112			$ 13,540		$ (331)	$ 101,039	$ (136)	[1]

[1] All amounts are net of income taxes.

[2] Derived from audited consolidated financial statements.