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)			(11,237)			(11,237)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2021 and 2022 and $0.44 and $0.44 per share for the six months ended March 31, 2021 and 2022, respectively)			(8,377)			(8,377)
Other comprehensive income (loss)					9,992	9,992
Issue restricted stock (less forfeitures) (in shares)	55,518
Vesting of restricted stock (in shares)	21,280
Purchase of treasury stock				(238)		(238)
Purchase of treasury stock (in shares)	(10,439)
Stock compensation		3,371				3,371
Balance at Jun. 30, 2021	$ 13	260,954	101,329	(2,675)	(64,609)	295,012
Balance (in shares) at Jun. 30, 2021	12,688,730
Balance at Mar. 31, 2021	$ 13	259,796	103,721	(2,675)	(66,964)	293,891
Balance (in shares) at Mar. 31, 2021	12,688,730
Increase (Decrease) in Stockholders' Equity
Net income (loss)			422			422
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2021 and 2022 and $0.44 and $0.44 per share for the six months ended March 31, 2021 and 2022, respectively)			(2,814)			(2,814)
Other comprehensive income (loss)					2,355	2,355
Stock compensation		1,158				1,158
Balance at Jun. 30, 2021	$ 13	260,954	101,329	(2,675)	(64,609)	295,012
Balance (in shares) at Jun. 30, 2021	12,688,730
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 March 31, 2021 and 2022 and $0.44 and $0.44 per share for the six months ended March 31, 2021 and 2022, 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 March 31, 2021 and 2022 and $0.44 and $0.44 per share for the six months ended March 31, 2021 and 2022, 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