Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues, net of returns and allowances	$ 21,003	$ 28,743	$ 64,861	$ 76,974
Cost of sales	13,153	18,560	40,064	48,249
Gross profit	7,850	10,183	24,797	28,725
Selling, general and administrative	5,718	6,775	18,137	19,518
Research, development and engineering	746	582	2,325	2,035
Restructuring charges	35	0	1,072	0
Operating income	1,351	2,826	3,263	7,172
Gain on sale of other assets	0	2,883	0	2,883
Income from equity method investment	0	232	0	234
Interest income and other, net	249	410	511	396
Income from continuing operations before income taxes	1,600	6,351	3,774	10,685
Income tax provision	707	1,372	1,621	2,944
Income from continuing operations, net of tax	893	4,979	2,153	7,741
Income (loss) from discontinued operations, net of tax	1,154	(8)	(8,113)	6,517
Net income (loss)	$ 2,047	$ 4,971	$ (5,960)	$ 14,258
Income (Loss) Per Basic Share:
Basic income per share from continuing operations (USD per share)	$ 0.06	$ 0.33	$ 0.15	$ 0.52
Basic income (loss) per share from discontinued operations (USD per share)	0.08	0.00	(0.57)	0.44
Net income (loss) per basic share (USD per share)	0.14	0.33	(0.42)	0.96
Income (Loss) Per Diluted Share:
Diluted income per share from continuing operations (USD per share)	0.06	0.33	0.15	0.51
Diluted income (loss) per share from discontinued operations (USD per share)	0.08	0.00	(0.57)	0.43
Net income (loss) per diluted share (USD per share)	$ 0.14	$ 0.33	$ (0.42)	$ 0.94
Weighted average shares outstanding - basic (in shares)	14,245	14,925	14,231	14,867
Weighted average shares outstanding - diluted (in shares)	14,316	15,091	14,267	15,181