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, 2017	$ 13	$ 248,733	$ 159,366	$ (1,646)	$ (72,694)	$ 333,772
Balance (in shares) at Sep. 30, 2017	12,509,757
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(23,881)			(23,881)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2018 and 2019, and $0.44 and $0.44 per share for the six months ended March 31, 2018 and 2019, respectively)			(8,272)			(8,272)
Other comprehensive income (loss)					3,398	3,398
Issue restricted stock (less forfeitures) (in shares)	6,333
Purchase of treasury stock				(223)		(223)
Purchase of treasury stock (in shares)	(6,937)
Stock compensation		1,920				1,920
Balance at Jun. 30, 2018	$ 13	250,653	127,213	(1,869)	(69,296)	306,714
Balance (in shares) at Jun. 30, 2018	12,509,153
Balance at Mar. 31, 2018	$ 13	250,050	129,256	(1,869)	(67,245)	310,205
Balance (in shares) at Mar. 31, 2018	12,520,020
Increase (Decrease) in Stockholders' Equity
Net income (loss)			713			713
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2018 and 2019, and $0.44 and $0.44 per share for the six months ended March 31, 2018 and 2019, respectively)			(2,756)			(2,756)
Other comprehensive income (loss)					(2,051)	(2,051)
Issue restricted stock (less forfeitures) (in shares)	(10,867)
Stock compensation		603				603
Balance at Jun. 30, 2018	$ 13	250,653	127,213	(1,869)	(69,296)	306,714
Balance (in shares) at Jun. 30, 2018	12,509,153
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 March 31, 2018 and 2019, and $0.44 and $0.44 per share for the six months ended March 31, 2018 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 March 31, 2018 and 2019, and $0.44 and $0.44 per share for the six months ended March 31, 2018 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