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)			(24,594)			(24,594)
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)			(5,516)			(5,516)
Other comprehensive income (loss)					5,449	5,449
Issue restricted stock (less forfeitures) (in shares)	17,200
Purchase of treasury stock				(223)		(223)
Purchase of treasury stock (in shares)	(6,937)
Stock compensation		1,317				1,317
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
Balance at Dec. 31, 2017	$ 13	249,339	134,082	(1,876)	(70,871)	310,687
Balance (in shares) at Dec. 31, 2017	12,520,320
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(2,068)			(2,068)
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)			(2,758)			(2,758)
Other comprehensive income (loss)					3,626	3,626
Issue restricted stock (less forfeitures) (in shares)	(300)
Purchase of treasury stock				7		7
Stock compensation		711				711
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
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
Balance at Dec. 31, 2018	$ 13	251,718	122,226	(2,177)	(43,156)	328,624
Balance (in shares) at Dec. 31, 2018	12,517,492
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)			(94)			(94)
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)			(5,517)			(5,517)
Other comprehensive income (loss)					1,019	1,019
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				(308)		(308)
Purchase of treasury stock (in shares)	(9,226)
Stock compensation		1,157				1,157
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
Balance at Dec. 31, 2018	$ 13	251,718	122,226	(2,177)	(43,156)	328,624
Balance (in shares) at Dec. 31, 2018	12,517,492
Increase (Decrease) in Stockholders' Equity
Net income (loss)			1,509			1,509
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)			(2,758)			(2,758)
Other comprehensive income (loss)					1,610	1,610
Issue restricted stock (less forfeitures) (in shares)	(2,012)
Stock compensation		707				707
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