Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues, net of returns and allowances	$ 17,975,000	$ 20,692,000
Cost of sales	10,463,000	12,518,000
Gross profit	7,512,000	8,174,000
Selling, general and administrative	5,213,000	5,915,000
Research, development and engineering	1,245,000	622,000
Operating income	1,054,000	1,637,000
Loss on sale of subsidiary		(2,793,000)
Interest expense and other, net	(255,000)	(70,000)
Income (loss) from continuing operations before income taxes	799,000	(1,226,000)
Income tax provision	80,000	41,000
Income (loss) from continuing operations, net of tax	719,000	(1,267,000)
Loss from discontinued operations, net of tax		(665,000)
Net income (loss)	$ 719,000	$ (1,932,000)
Income (Loss) Per Basic Share:
Basic income (loss) per share from continuing operations	$ 0.05	$ (0.09)
Basic loss per share from discontinued operations		(0.05)
Net income (loss) per basic share	0.05	(0.14)
Income (Loss) Per Diluted Share:
Diluted income (loss) per share from continuing operations	0.05	(0.09)
Diluted loss per share from discontinued operations		(0.05)
Net income (loss) per diluted share	$ 0.05	$ (0.14)
Weighted average shares outstanding - basic	14,072	14,290
Weighted average shares outstanding - diluted	14,117	14,290