Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 127,854	$ 118,716	$ 234,423	$ 225,291
Cost of goods sold	108,771	101,563	201,904	189,867
Gross profit	19,083	17,153	32,519	35,424
Selling, general and administrative expenses	17,067	16,675	32,969	33,549
Research and development expenses	1,713	1,601	3,537	3,274
Amortization of intangible assets	0	44	0	88
Operating income (loss)	303	(1,167)	(3,987)	(1,487)
Other income	(279)	0	(279)	0
Interest expense (income)	(13)	4	(16)	(57)
Income (loss) before income taxes	595	(1,171)	(3,692)	(1,430)
Income tax provision (benefit)	1,812	(946)	371	(841)
Net loss	$ (1,217)	$ (225)	$ (4,063)	$ (589)
Loss per share:
Basic (in dollars per share)	$ (0.10)	$ (0.02)	$ (0.34)	$ (0.05)
Diluted (in dollars per share)	$ (0.10)	$ (0.02)	$ (0.34)	$ (0.05)
Weighted average shares:
Basic (in shares)	11,801	11,707	11,783	11,690
Diluted (in shares)	11,801	11,707	11,783	11,690
Dividends per share (in dollars per share)	$ 0.26	$ 0.26	$ 0.52	$ 0.52