Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning 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)
Shares retired	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	3,646			(743)	4,389
Performance and restricted share expense	469		469
Share transactions under employee stock plans	(16)	71	(87)
Ending balance at Sep. 30, 2021	$ 49,622	$ 5,987	$ 11,118	$ 41,596	$ (9,079)