CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Sep. 30, 2018	$ 13,000	$ 251,053,000	$ 126,588,000	$ (1,869,000)	$ (42,565,000)	$ 333,220,000
Balance (in shares) at Sep. 30, 2018	12,504,478
Increase (Decrease) in Stockholders' Equity
Net income (loss)			(94,000)			(94,000)
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2019 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2019, respectively)			(5,517,000)			(5,517,000)
Other comprehensive income (loss)					1,019,000	1,019,000
Exercise of stock options		215,000				215,000
Exercise of stock options (in shares)	12,084
Issue restricted stock (less forfeitures) (in shares)	8,144
Purchase of treasury stock				(308,000)		(308,000)
Purchase of treasury stock (in shares)	(9,226)
Stock compensation		1,157,000				1,157,000
Balance at Mar. 31, 2019	$ 13,000	252,425,000	120,977,000	(2,177,000)	(41,546,000)	329,692,000
Balance (in shares) at Mar. 31, 2019	12,515,480
Balance at Dec. 31, 2018	$ 13,000	251,718,000	122,226,000	(2,177,000)	(43,156,000)	328,624,000
Balance (in shares) at Dec. 31, 2018	12,517,492
Increase (Decrease) in Stockholders' Equity
Net income (loss)			1,509,000			1,509,000
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2019 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2019, respectively)			(2,758,000)			(2,758,000)
Other comprehensive income (loss)					1,610,000	1,610,000
Issue restricted stock (less forfeitures) (in shares)	(2,012)
Stock compensation		707,000				707,000
Balance at Mar. 31, 2019	$ 13,000	252,425,000	120,977,000	(2,177,000)	(41,546,000)	329,692,000
Balance (in shares) at Mar. 31, 2019	12,515,480
Balance at Sep. 30, 2019	$ 13,000	253,843,000	125,296,000	(2,239,000)	(80,638,000)	296,275,000
Balance (in shares) at Sep. 30, 2019	12,513,500
Increase (Decrease) in Stockholders' Equity
Net income (loss)			7,336,000			7,336,000
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2019 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2019, respectively)			(5,618,000)			(5,618,000)
Other comprehensive income (loss)					3,764,000	3,764,000
Exercise of stock options		422,000				422,000
Exercise of stock options (in shares)	12,400
Reclass due to adoption of ASU 2018-02			13,283,000		(13,283,000)
Issue restricted stock (less forfeitures) (in shares)	36,461
Purchase of treasury stock	$ (5,440)			(198,000)		(198,000)
Stock compensation		1,631,000				1,631,000
Balance at Mar. 31, 2020	$ 13,000	255,896,000	140,297,000	(2,437,000)	(90,157,000)	303,612,000
Balance (in shares) at Mar. 31, 2020	12,556,921
Balance at Dec. 31, 2019	$ 13,000	254,999,000	139,010,000	(2,437,000)	(87,959,000)	303,626,000
Balance (in shares) at Dec. 31, 2019	12,556,255
Increase (Decrease) in Stockholders' Equity
Net income (loss)			4,068,000			4,068,000
Dividends paid and accrued ($0.22 and $0.22 per share for the three months ended March 31, 2020 and 2019 and $0.44 and $0.44 per share for the six months ended March 31, 2020 and 2019, respectively)			(2,781,000)			(2,781,000)
Other comprehensive income (loss)					(2,198,000)	(2,198,000)
Issue restricted stock (less forfeitures) (in shares)	666
Stock compensation		897,000				897,000
Balance at Mar. 31, 2020	$ 13,000	$ 255,896,000	$ 140,297,000	$ (2,437,000)	$ (90,157,000)	$ 303,612,000
Balance (in shares) at Mar. 31, 2020	12,556,921