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, 2018	$ 13	$ 251,053	$ 126,588	$ (1,869)	$ (42,565)	$ 333,220
Balance (in shares) at Sep. 30, 2018	12,504,478
Increase (Decrease) in Stockholders' Equity
Net income (loss)			3,708			3,708
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2020 and 2019 and $0.66 and $0.66 per share for the nine months ended June 30, 2020 and 2019, respectively)			(8,277)			(8,277)
Other comprehensive income (loss)					(204)	(204)
Exercise of stock options		215				215
Exercise of stock options (in shares)	12,084
Issue restricted stock (less forfeitures) (in shares)	8,144
Purchase of treasury stock				(370)		(370)
Purchase of treasury stock (in shares)	(11,356)
Stock compensation		1,848				1,848
Balance at Jun. 30, 2019	$ 13	253,116	122,019	(2,239)	(42,769)	330,140
Balance (in shares) at Jun. 30, 2019	12,513,350
Balance at Mar. 31, 2019	$ 13	252,425	120,977	(2,177)	(41,546)	329,692
Balance (in shares) at Mar. 31, 2019	12,515,480
Increase (Decrease) in Stockholders' Equity
Net income (loss)			3,802			3,802
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2020 and 2019 and $0.66 and $0.66 per share for the nine months ended June 30, 2020 and 2019, respectively)			(2,760)			(2,760)
Other comprehensive income (loss)					(1,223)	(1,223)
Purchase of treasury stock				(62)		(62)
Purchase of treasury stock (in shares)	(2,130)
Stock compensation		691				691
Balance at Jun. 30, 2019	$ 13	253,116	122,019	(2,239)	(42,769)	330,140
Balance (in shares) at Jun. 30, 2019	12,513,350
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)			(761)			(761)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2020 and 2019 and $0.66 and $0.66 per share for the nine months ended June 30, 2020 and 2019, respectively)			(8,410)			(8,410)
Other comprehensive income (loss)					5,307	5,307
Exercise of stock options		422				422
Exercise of stock options (in shares)	12,400
Reclass due to adoption of ASU 2018-02			13,283		(13,283)
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		2,489				2,489
Balance at Jun. 30, 2020	$ 13	256,754	129,408	(2,437)	(88,614)	295,124
Balance (in shares) at Jun. 30, 2020	12,556,921
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
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(8,097)			(8,097)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended June 30, 2020 and 2019 and $0.66 and $0.66 per share for the nine months ended June 30, 2020 and 2019, respectively)			(2,792)			(2,792)
Other comprehensive income (loss)					1,543	1,543
Stock compensation		858				858
Balance at Jun. 30, 2020	$ 13	$ 256,754	$ 129,408	$ (2,437)	$ (88,614)	$ 295,124
Balance (in shares) at Jun. 30, 2020	12,556,921