Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues	$ 134,150	$ 109,351
Cost of goods sold	112,324	94,720
Gross profit	21,826	14,631
Selling, general and administrative expenses	17,289	15,928
Research and development expenses	1,474	1,694
Amortization of intangible assets	44	44
Operating income (loss)	3,019	(3,035)
Interest expense	67	56
Interest income	(381)	(157)
Income (loss) before income taxes	3,333	(2,934)
Income tax provision (benefit)	558	(239)
Net income (loss)	$ 2,775	$ (2,695)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.24	$ (0.23)
Diluted (in dollars per share)	$ 0.24	$ (0.23)
Weighted average shares:
Basic (in shares)	11,614	11,551
Diluted (in shares)	11,665	11,551
Dividends per share (in dollars per share)	$ 0.26	$ 0.26