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)			(11,659)			(11,659)
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)			(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, 2021 and 2022 and $0.44 and $0.44 per share for the six months ended March 31, 2021 and 2022, 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
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)			13,143			13,143
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)			(5,539)			(5,539)
Other comprehensive income (loss)					(861)	(861)
Exercise of stock options		224				224
Exercise of stock options (in shares)	6,533
Issue restricted stock (less forfeitures) (in shares)	25,182
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		1,817				1,817
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
Balance at Dec. 31, 2021	$ 13	263,126	102,865	(14,023)	(11,772)	340,209
Balance (in shares) at Dec. 31, 2021	12,455,839
Increase (Decrease) in Stockholders' Equity
Net income (loss)			8,484			8,484
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)			(2,730)			(2,730)
Other comprehensive income (loss)					(1,430)	(1,430)
Exercise of stock options		109				109
Exercise of stock options (in shares)	2,883
Issue restricted stock (less forfeitures) (in shares)	(6,522)
Vesting of restricted stock (in shares)	11,993
Purchase of treasury stock				(195)		(195)
Purchase of treasury stock (in shares)	(5,240)
Stock compensation		863				863
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