Selected Quarterly Data (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2021

Selected Quarterly Financial Information [Abstract]

Schedule of Selected Unaudited Consolidated Quarterly Financial Information

The following table sets forth selected unaudited consolidated quarterly financial information for the years ended September 30, 2021 and 2020 (in thousands, except percentages and per share amounts):

	Fiscal Year 2021
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue, net of returns and allowances	$	17,975		$	19,790		$	23,100		$	24,340
Cost of sales		10,463			12,062			13,021			15,129
Gross profit		7,512			7,728			10,079			9,211
Selling, general and administrative		5,213			5,688			7,281			6,558
Research, development and engineering		1,245			1,869			1,523			1,342
Restructuring charges		—			—			71			15
Operating income		1,054			171			1,204			1,296
Interest (expense) income and other, net		(255	)		73			(155	)		46
Income from continuing operations    before income taxes		799			244			1,049			1,342
Income tax provision		80			490			680			676
Net income (loss)	$	719		$	(246	)	$	369		$	666
Gross margin		41.8	%		39.1	%		43.6	%		37.8	%
Operating margin		5.9	%		0.9	%		5.2	%		5.3	%
Income (Loss) Per Share:
Net income (loss) per basic share	$	0.05		$	(0.02	)	$	0.03		$	0.05
Weighted average shares outstanding - basic		14,072			14,151			14,176			14,190
Net income (loss) per diluted share	$	0.05		$	(0.02	)	$	0.03		$	0.05
Weighted average shares outstanding - diluted		14,117			14,151			14,373			14,387

	Fiscal Year 2020
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue, net of returns and allowances	$	20,692		$	14,460		$	15,227		$	15,084
Cost of sales		12,518			9,102			9,276			10,126
Gross profit		8,174			5,358			5,951			4,958
Selling, general and administrative		5,915			5,415			4,804			5,263
Research, development and engineering		622			915			899			876
Restructuring charges		—			—			217			—
Operating income (loss)		1,637			(972	)		31			(1,181	)
Loss on sale of subsidiary		(2,793	)		—			—			—
Interest (expense) income and other, net		(70	)		595			(13	)		(350	)
(Loss) income from continuing operations before    income taxes		(1,226	)		(377	)		18			(1,531	)
Income tax provision		41			166			90			494
Loss from continuing operations,    net of tax		(1,267	)		(543	)		(72	)		(2,025	)
Loss from discontinued operations,    net of tax		(665	)		(11,151	)		—			—
Net loss	$	(1,932	)	$	(11,694	)	$	(72	)	$	(2,025	)
Gross margin		39.5	%		37.1	%		39.1	%		32.9	%
Operating margin		7.9	%		(6.7	)%		0.2	%		(7.8	)%
Loss Per Basic Share:
Basic loss per share from continuing    operations	$	(0.09	)	$	(0.04	)	$	(0.01	)	$	(0.14	)
Basic loss per share from discontinued    operations	$	(0.05	)	$	(0.79	)	$	—		$	—
Net loss per basic share	$	(0.14	)	$	(0.83	)	$	(0.01	)	$	(0.14	)
Loss Per Diluted Share:
Diluted loss per share from continuing    operations	$	(0.09	)	$	(0.04	)	$	(0.01	)	$	(0.14	)
Diluted loss per share from discontinued    operations	$	(0.05	)	$	(0.79	)	$	—		$	—
Net loss per diluted share	$	(0.14	)	$	(0.83	)	$	(0.01	)	$	(0.14	)
Weighted average shares outstanding - basic		14,290			14,150			14,155			14,052
Weighted average shares outstanding - diluted		14,290			14,150			14,155			14,052