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, 2016	$ 12	$ 246,625	$ 180,565	$ (1,380)	$ (114,523)	$ 311,299
Balance (in shares) at Sep. 30, 2016	12,491,149
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(10,190)			(10,190)
Dividends paid and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2017 and 2018 and 2019, respectively)			(11,009)			(11,009)
Other comprehensive income (loss)					41,829	41,829
Issue restricted stock (less forfeitures)	$ 1	(1)
Issue restricted stock (less forfeitures) (in shares)	24,625
Purchase of treasury stock				(266)		(266)
Purchase of treasury stock (in shares)	(6,017)
Stock compensation		2,109				2,109
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)			(21,751)			(21,751)
Dividends paid and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2017 and 2018 and 2019, respectively)			(11,027)			(11,027)
Other comprehensive income (loss)					30,129	30,129
Issue restricted stock (less forfeitures) (in shares)	1,658
Purchase of treasury stock				(223)		(223)
Purchase of treasury stock (in shares)	(6,937)
Stock compensation		2,320				2,320
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)			9,745			9,745
Dividends paid and accrued ($0.88 and $0.88 and $0.88 per share for the year ended September 30, 2017 and 2018 and 2019, respectively)			(11,037)			(11,037)
Other comprehensive income (loss)					(38,073)	(38,073)
Exercise of stock options		215				215
Exercise of stock options (in shares)	12,084
Issue restricted stock (less forfeitures) (in shares)	8,294
Purchase of treasury stock				(370)		(370)
Purchase of treasury stock (in shares)	(11,356)
Stock compensation		2,575				2,575
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