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, 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			28,847			28,847
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2023 and 2024, and $0.44 and $0.44 per share for the six months ended March 31, 2023 and 2024, respectively)			(8,437)			(8,437)
Other comprehensive income (loss)					7,890	7,890
Exercise of stock options		8,228				8,228
Exercise of stock options (in shares)	218,576
Issue restricted stock (less forfeitures) (in shares)	38,623
Vesting of restricted stock (in shares)	12,429
Purchase of treasury stock				(925)		(925)
Purchase of treasury stock (in shares)	(17,531)
Stock compensation		2,410				2,410
Balance at Jun. 30, 2023	$ 13	276,831	155,450	(15,591)	(3,202)	413,501
Balance (in shares) at Jun. 30, 2023	12,731,838
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
Increase (Decrease) in Stockholders' Equity
Net income			8,759			8,759
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2023 and 2024, and $0.44 and $0.44 per share for the six months ended March 31, 2023 and 2024, respectively)			(2,823)			(2,823)
Other comprehensive income (loss)					937	937
Issue restricted stock (less forfeitures) (in shares)	590
Stock compensation		869				869
Balance at Jun. 30, 2023	$ 13	276,831	155,450	(15,591)	(3,202)	413,501
Balance (in shares) at Jun. 30, 2023	12,731,838
Balance at Sep. 30, 2023	$ 13	277,713	165,825	(15,600)	6,373	434,324
Balance (in shares) at Sep. 30, 2023	12,731,661
Increase (Decrease) in Stockholders' Equity
Net income			24,378			24,378
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2023 and 2024, and $0.44 and $0.44 per share for the six months ended March 31, 2023 and 2024, respectively)			(8,485)			(8,485)
Other comprehensive income (loss)					560	560
Issue restricted stock (less forfeitures) (in shares)	44,150
Vesting of restricted stock (in shares)	39,756
Purchase of treasury stock				(1,541)		(1,541)
Purchase of treasury stock (in shares)	(32,675)
Stock compensation		2,962				2,962
Balance at Jun. 30, 2024	$ 13	280,675	181,718	(17,141)	6,933	452,198
Balance (in shares) at Jun. 30, 2024	12,782,892
Balance at Mar. 31, 2024	$ 13	279,699	176,446	(17,141)	7,363	446,380
Balance (in shares) at Mar. 31, 2024	12,782,892
Increase (Decrease) in Stockholders' Equity
Net income			8,125			8,125
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2023 and 2024, and $0.44 and $0.44 per share for the six months ended March 31, 2023 and 2024, respectively)			(2,853)			(2,853)
Other comprehensive income (loss)					(430)	(430)
Stock compensation		976				976
Balance at Jun. 30, 2024	$ 13	$ 280,675	$ 181,718	$ (17,141)	$ 6,933	$ 452,198
Balance (in shares) at Jun. 30, 2024	12,782,892