Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Adoption Adjustment	Common Shares	Additional Paid-In Capital	Retained Earnings	Retained Earnings Adoption Adjustment	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2018	$ 44,189	$ 3,598	$ 5,690	$ 10,031	$ 37,097	$ 3,598	$ (8,629)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(12,186)				(7,506)		(4,680)
Shares retired	(62)		(21)		(41)
Performance and restricted share expense	511			511
Share transactions under employee stock plans	4		108	(104)
Ending balance at Sep. 30, 2019	36,054		5,777	10,438	33,148		(13,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	9,032				9,191		(159)
Other	47			47
Performance and restricted share expense	398			398
Share transactions under employee stock plans	(8)		139	(147)
Ending balance at Sep. 30, 2020	$ 45,523		$ 5,916	$ 10,736	$ 42,339		$ (13,468)