Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 106,575	$ 134,150
Cost of goods sold	88,304	112,324
Gross profit	18,271	21,826
Selling, general and administrative expenses	16,874	17,289
Research and development expenses	1,673	1,474
Amortization of intangible assets	44	44
Operating income (loss)	(320)	3,019
Interest expense	50	67
Interest income	(111)	(381)
Income (loss) before income taxes	(259)	3,333
Income tax provision	105	558
Net income (loss)	$ (364)	$ 2,775
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.03)	$ 0.24
Diluted (in dollars per share)	$ (0.03)	$ 0.24
Weighted average shares:
Basic (in shares)	11,674	11,614
Diluted (in shares)	11,674	11,665
Dividends per share (in dollars per share)	$ 0.26	$ 0.26