CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Adjusted Balance Accumulated Earnings	Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance (ASU 2018-02) at Sep. 30, 2019	$ 13,283	$ (13,283)
Balance at Sep. 30, 2019			$ 13	$ 253,843	$ 125,296	$ (2,239)	$ (80,638)	$ 296,275
Balance (in shares) at Sep. 30, 2019			12,513,500
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(6,478)			(6,478)
Dividends paid and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2020 and 2021 and 2022, respectively)					(11,158)			(11,158)
Other comprehensive income (loss)							19,320	19,320
Exercise of stock options				422				422
Exercise of stock options (in shares)			12,400
Issue restricted stock (less forfeitures) (in shares)			101,911
Purchase of treasury stock						(198)		(198)
Purchase of treasury stock (in shares)			(5,440)
Stock compensation				3,318				3,318
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 and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2020 and 2021 and 2022, respectively)					(11,245)			(11,245)
Other comprehensive income (loss)							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 and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2020 and 2021 and 2022, respectively)					(11,062)			(11,062)
Other comprehensive income (loss)							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