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, 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)			28,751			28,751
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2022 and 2023, and $0.66 and $0.66 per share for the nine months ended June 30, 2022 and 2023, respectively)			(8,271)			(8,271)
Other comprehensive income (loss)					(6,030)	(6,030)
Exercise of stock options		347				347
Exercise of stock options (in shares)	9,558
Issue restricted stock (less forfeitures) (in shares)	25,682
Vesting of restricted stock (in shares)	32,904
Purchase of treasury stock				(6,795)		(6,795)
Purchase of treasury stock (in shares)	(167,806)
Stock compensation		2,750				2,750
Balance at Jun. 30, 2022	$ 13	265,154	121,495	(14,218)	(18,371)	354,073
Balance (in shares) at Jun. 30, 2022	12,462,478
Balance at Mar. 31, 2022	$ 13	264,098	108,619	(14,218)	(13,202)	345,310
Balance (in shares) at Mar. 31, 2022	12,458,953
Increase (Decrease) in Stockholders' Equity
Net income (loss)			15,608			15,608
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2022 and 2023, and $0.66 and $0.66 per share for the nine months ended June 30, 2022 and 2023, respectively)			(2,732)			(2,732)
Other comprehensive income (loss)					(5,169)	(5,169)
Exercise of stock options		124				124
Exercise of stock options (in shares)	3,025
Issue restricted stock (less forfeitures) (in shares)	500
Stock compensation		932				932
Balance at Jun. 30, 2022	$ 13	265,154	121,495	(14,218)	(18,371)	354,073
Balance (in shares) at Jun. 30, 2022	12,462,478
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)			28,847			28,847
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2022 and 2023, and $0.66 and $0.66 per share for the nine months ended June 30, 2022 and 2023, respectively)			(8,437)			(8,437)
Other comprehensive income (loss)					7,890	7,890
Exercise of stock options		8,228				8,228
Exercise of stock options (in shares)	218,576
Issue restricted stock (less forfeitures) (in shares)	38,623
Vesting of restricted stock (in shares)	12,429
Purchase of treasury stock				(925)		(925)
Purchase of treasury stock (in shares)	(17,531)
Stock compensation		2,410				2,410
Balance at Jun. 30, 2023	$ 13	276,831	155,450	(15,591)	(3,202)	413,501
Balance (in shares) at Jun. 30, 2023	12,731,838
Balance at Mar. 31, 2023	$ 13	275,962	149,514	(15,591)	(4,139)	405,759
Balance (in shares) at Mar. 31, 2023	12,731,248
Increase (Decrease) in Stockholders' Equity
Net income (loss)			8,759			8,759
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2022 and 2023, and $0.66 and $0.66 per share for the nine months ended June 30, 2022 and 2023, respectively)			(2,823)			(2,823)
Other comprehensive income (loss)					937	937
Issue restricted stock (less forfeitures) (in shares)	590
Stock compensation		869				869
Balance at Jun. 30, 2023	$ 13	$ 276,831	$ 155,450	$ (15,591)	$ (3,202)	$ 413,501
Balance (in shares) at Jun. 30, 2023	12,731,838