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	16,550					16,550
Other comprehensive loss	(624)						(624)
Repurchase of common stock (in shares)				(135,791)
Repurchase of common stock	$ (3,651)			$ (3,651)
Exercise of stock options (in shares)	29,770			29,770
Exercise of stock options	$ 359			$ 359
Common stock dividends	(5,418)					(5,418)
Stock option compensation expense			$ 204		$ 204
Balance at end of period (in shares) at Jun. 30, 2022				8,249,448
Balance at end of period at Jun. 30, 2022	214,319			$ 39,585		175,299	(565)	[1]
Balance at beginning of period (in shares) at Mar. 31, 2022				8,305,826
Balance at beginning of period at Mar. 31, 2022	212,269			$ 40,988		171,388	(107)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,738					5,738
Other comprehensive loss	(458)						(458)
Repurchase of common stock (in shares)				(58,678)
Repurchase of common stock	(1,502)			$ (1,502)
Exercise of stock options (in shares)				2,300
Exercise of stock options	27			$ 27
Common stock dividends	(1,827)					(1,827)
Stock option compensation expense			72		72
Balance at end of period (in shares) at Jun. 30, 2022				8,249,448
Balance at end of period at Jun. 30, 2022	214,319			$ 39,585		175,299	(565)	[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	20,476					20,476
Other comprehensive loss	(27)						(27)
Repurchase of common stock (in shares)				(154,833)
Repurchase of common stock	$ (4,119)			$ (4,119)
Exercise of stock options (in shares)	27,055			27,055
Exercise of stock options	$ 534			$ 534
Common stock dividends	(6,405)					(6,405)
Stock option compensation expense			235		235
Balance at end of period (in shares) at Jun. 30, 2023				8,094,174
Balance at end of period at Jun. 30, 2023	229,263			$ 35,401		194,606	(744)	[1]
Balance at beginning of period (in shares) at Mar. 31, 2023				8,203,174
Balance at beginning of period at Mar. 31, 2023	227,661			$ 37,979		190,177	(495)	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,306					6,306
Other comprehensive loss	(249)						(249)
Repurchase of common stock (in shares)				(110,000)
Repurchase of common stock	(2,674)			$ (2,674)
Exercise of stock options (in shares)				1,000
Exercise of stock options	17			$ 17
Common stock dividends	(1,877)					(1,877)
Stock option compensation expense			$ 79		$ 79
Balance at end of period (in shares) at Jun. 30, 2023				8,094,174
Balance at end of period at Jun. 30, 2023	$ 229,263			$ 35,401		$ 194,606	$ (744)	[1]

[1] All amounts are net of income taxes.

[2] Derived from audited consolidated financial statements.