CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Sep. 30, 2020	$ 13	$ 257,583	$ 120,943	$ (2,437)	$ (74,601)	$ 301,501
Balance (in shares) at Sep. 30, 2020	12,622,371
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(8,683)			(8,683)
Dividends paid ($0.88 per share for the year ended September 30, 2021, 2022 and 2023, respectively)			(11,245)			(11,245)
Other comprehensive income					62,260	62,260
Issue restricted stock (less forfeitures) (in shares)	76,498
Purchase of treasury stock				(4,986)		(4,986)
Purchase of treasury stock (in shares)	(136,729)
Stock compensation		4,474				4,474
Balance at Sep. 30, 2021	$ 13	262,057	101,015	(7,423)	(12,341)	343,321
Balance (in shares) at Sep. 30, 2021	12,562,140
Increase (Decrease) in Stockholders' Equity
Net income (loss)			45,087			45,087
Dividends paid ($0.88 per share for the year ended September 30, 2021, 2022 and 2023, respectively)			(11,062)			(11,062)
Other comprehensive income					1,249	1,249
Exercise of stock options		537				537
Exercise of stock options (in shares)	14,558
Issue restricted stock (less forfeitures) (in shares)	82,437
Purchase of treasury stock				(7,243)		(7,243)
Purchase of treasury stock (in shares)	(179,394)
Stock compensation		3,599				3,599
Balance at Sep. 30, 2022	$ 13	266,193	135,040	(14,666)	(11,092)	375,488
Balance (in shares) at Sep. 30, 2022	12,479,741
Increase (Decrease) in Stockholders' Equity
Net income (loss)			41,975			41,975
Dividends paid ($0.88 per share for the year ended September 30, 2021, 2022 and 2023, respectively)			(11,190)			(11,190)
Other comprehensive income					17,465	17,465
Exercise of stock options		8,230				8,230
Exercise of stock options (in shares)	218,576
Issue restricted stock (less forfeitures) (in shares)	51,052
Purchase of treasury stock				(934)		(934)
Purchase of treasury stock (in shares)	(17,708)
Stock compensation		3,290				3,290
Balance at Sep. 30, 2023	$ 13	$ 277,713	$ 165,825	$ (15,600)	$ 6,373	$ 434,324
Balance (in shares) at Sep. 30, 2023	12,731,661