Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues, net of returns and allowances	$ 20,633	$ 21,115	$ 43,858	$ 48,231
Cost of sales	12,706	12,533	26,911	29,689
Gross profit	7,927	8,582	16,947	18,542
Selling, general and administrative	5,793	6,319	12,419	12,743
Research, development and engineering	713	778	1,579	1,453
Restructuring charges	173	0	1,037	0
Operating income	1,248	1,485	1,912	4,346
Income from equity method investment	0	28	0	2
Interest income (expense) and other income, net	96	(32)	262	(14)
Income from continuing operations before income taxes	1,344	1,481	2,174	4,334
Income tax provision	332	420	914	1,572
Income from continuing operations, net of tax	1,012	1,061	1,260	2,762
(Loss) income from discontinued operations, net of tax	(6,647)	1,774	(9,267)	6,525
Net (loss) income	$ (5,635)	$ 2,835	$ (8,007)	$ 9,287
(Loss) Income Per Basic Share:
Basic income per share from continuing operations (USD per share)	$ 0.07	$ 0.07	$ 0.09	$ 0.19
Basic (loss) income per share from discontinued operations (USD per share)	(0.47)	0.12	(0.65)	0.44
Net (loss) income per basic share (USD per share)	(0.40)	0.19	(0.56)	0.63
(Loss) Income Per Diluted Share:
Diluted income per share from continuing operations (USD per share)	0.07	0.07	0.09	0.18
Diluted (loss) income per share from discontinued operations (USD per share)	(0.47)	0.12	(0.65)	0.43
Net (loss) income per diluted share (USD per share)	$ (0.40)	$ 0.19	$ (0.56)	$ 0.61
Weighted average shares outstanding - basic (in shares)	14,228	14,891	14,224	14,835
Weighted average shares outstanding - diluted (in shares)	14,258	15,154	14,255	15,223