CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Adjustment Accumulated Earnings	Adjustment 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)					7,336			7,336
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2021 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2021, respectively)					(5,618)			(5,618)
Other comprehensive income (loss)							3,764	3,764
Exercise of stock options				422				422
Exercise of stock options (in shares)			12,400
Issue restricted stock (less forfeitures) (in shares)			36,461
Purchase of treasury stock						(198)		(198)
Purchase of treasury stock (in shares)			(5,440)
Stock compensation				1,631				1,631
Balance at Mar. 31, 2020			$ 13	255,896	140,297	(2,437)	(90,157)	303,612
Balance (in shares) at Mar. 31, 2020			12,556,921
Balance at Dec. 31, 2019			$ 13	254,999	139,010	(2,437)	(87,959)	303,626
Balance (in shares) at Dec. 31, 2019			12,556,255
Increase (Decrease) in Stockholders' Equity
Net income (loss)					4,068			4,068
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2021 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2021, respectively)					(2,781)			(2,781)
Other comprehensive income (loss)							(2,198)	(2,198)
Issue restricted stock (less forfeitures) (in shares)			666
Stock compensation				897				897
Balance at Mar. 31, 2020			$ 13	255,896	140,297	(2,437)	(90,157)	303,612
Balance (in shares) at Mar. 31, 2020			12,556,921
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)					(11,659)			(11,659)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2021 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2021, respectively)					(5,563)			(5,563)
Other comprehensive income (loss)							7,637	7,637
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				2,213				2,213
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
Balance at Dec. 31, 2020			$ 13	258,642	110,134	(2,675)	(68,223)	297,891
Balance (in shares) at Dec. 31, 2020			12,682,147
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(3,632)			(3,632)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2021 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2021, respectively)					(2,781)			(2,781)
Other comprehensive income (loss)							1,259	1,259
Issue restricted stock (less forfeitures) (in shares)			(200)
Vesting of restricted stock (in shares)			6,783
Stock compensation				1,154				1,154
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