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)			13,143			13,143
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2022 and 2023, and $0.44 and $0.44 per share for the six months ended March 31, 2022 and 2023, 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, 2022 and 2023, and $0.44 and $0.44 per share for the six months ended March 31, 2022 and 2023, 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
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)			20,088			20,088
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2022 and 2023, and $0.44 and $0.44 per share for the six months ended March 31, 2022 and 2023, respectively)			(5,614)			(5,614)
Other comprehensive income (loss)					6,953	6,953
Exercise of stock options		8,228				8,228
Exercise of stock options (in shares)	218,576
Issue restricted stock (less forfeitures) (in shares)	38,033
Vesting of restricted stock (in shares)	12,429
Purchase of treasury stock				(925)		(925)
Purchase of treasury stock (in shares)	(17,531)
Stock compensation		1,541				1,541
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
Balance at Dec. 31, 2022	$ 13	270,340	139,976	(15,504)	(5,681)	389,144
Balance (in shares) at Dec. 31, 2022	12,597,607
Increase (Decrease) in Stockholders' Equity
Net income (loss)			12,349			12,349
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2022 and 2023, and $0.44 and $0.44 per share for the six months ended March 31, 2022 and 2023, respectively)			(2,811)			(2,811)
Other comprehensive income (loss)					1,542	1,542
Exercise of stock options		4,851				4,851
Exercise of stock options (in shares)	130,889
Issue restricted stock (less forfeitures) (in shares)	4,300
Purchase of treasury stock				(87)		(87)
Purchase of treasury stock (in shares)	(1,548)
Stock compensation		771				771
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