Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 118,062	$ 135,588	$ 403,781	$ 368,676
Cost of goods sold	96,718	111,873	330,926	310,255
Gross profit	21,344	23,715	72,855	58,421
Selling, general and administrative expenses	15,511	17,117	51,372	50,240
Research and development expenses	1,605	1,631	4,863	4,988
Amortization of intangible assets	44	44	132	132
Insurance proceeds	0	(950)	0	(950)
Restructuring and other, net	1,400	233	1,400	233
Operating income	2,784	5,640	15,088	3,778
Interest expense	52	59	179	170
Interest income	(190)	(305)	(901)	(707)
Income before income taxes	2,922	5,886	15,810	4,315
Income tax provision (benefit)	(559)	797	2,133	963
Net income	$ 3,481	$ 5,089	$ 13,677	$ 3,352
Earnings per share:
Basic (in dollars per share)	$ 0.30	$ 0.44	$ 1.18	$ 0.29
Diluted (in dollars per share)	$ 0.30	$ 0.44	$ 1.17	$ 0.29
Weighted average shares:
Basic (in shares)	11,631	11,579	11,622	11,567
Diluted (in shares)	11,698	11,603	11,686	11,589
Dividends per share (in dollars per share)	$ 0.26	$ 0.26	$ 0.78	$ 0.78