Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total		Stock Options	Common Stock	Common Stock Stock Options	Retained Earnings	Accumulated Other Compre-hensive Income (Loss)
Balance at beginning of period (in shares) at Sep. 30, 2021				8,355,469
Balance at beginning of period at Sep. 30, 2021	$ 206,899			$ 42,673		$ 164,167	$ 59	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,485					5,485
Other comprehensive loss	(17)						(17)
Repurchase of common stock (in shares)				(15,548)
Repurchase of common stock	$ (433)			$ (433)
Exercise of stock options (in shares)	8,900			8,900
Exercise of stock options	$ 130			$ 130
Common stock dividends	(1,755)					(1,755)
Stock option compensation expense			$ 66		$ 66
Balance at end of period (in shares) at Dec. 31, 2021				8,348,821
Balance at end of period at Dec. 31, 2021	210,375			$ 42,436		167,897	42	[1]
Balance at beginning of period (in shares) at Sep. 30, 2022				8,221,952
Balance at beginning of period at Sep. 30, 2022	218,569	[2]		$ 38,751		180,535	(717)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,507					7,507
Other comprehensive loss	(18)						(18)
Repurchase of common stock (in shares)				(10,570)
Repurchase of common stock	$ (348)			$ (348)
Exercise of stock options (in shares)	19,815			19,815
Exercise of stock options	$ 397			$ 397
Common stock dividends	(2,636)					(2,636)
Stock option compensation expense			$ 78		$ 78
Balance at end of period (in shares) at Dec. 31, 2022				8,231,197
Balance at end of period at Dec. 31, 2022	$ 223,549			$ 38,878		$ 185,406	$ (735)	[1]

[1] All amounts are net of income taxes.

[2] Derived from audited consolidated financial statements.