Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Sales:
Net sales	$ 138,878	$ 133,911
Costs and expenses:
Research and development	10,369	11,070
Sales, marketing and support	23,229	25,554
General and administrative	24,656	28,794
Total costs and expenses	144,532	153,506
Loss from operations	(5,654)	(19,595)
Interest income	1,507	886
Interest expense	3	56
Other income, net	772	7,111
Loss from continuing operations before income tax expense	(3,378)	(11,654)
Income tax expense (benefit) from continuing operations	546	(108)
Net loss from continuing operations	(3,924)	(11,546)
Income from discontinued operations, net of tax	28,025	1,783
Net Income (loss)	$ 24,101	$ (9,763)
Net loss from continuing operations per common share
Basic (in dollars per share)	$ (0.21)	$ (0.63)
Diluted (in dollars per share)	(0.21)	(0.63)
Net income from discontinued operations per common share
Basic (in dollars per share)	1.50	0.10
Diluted (in dollars per share)	1.50	0.10
Net income (loss) per common share
Basic (in dollars per share)	1.29	(0.54)
Diluted (in dollars per share)	$ 1.29	$ (0.54)
Weighted average number of shares outstanding:
Basic (in shares)	18,632	18,217
Diluted (in shares)	18,632	18,217
Product
Sales:
Net sales	$ 26,970	$ 30,012
Costs and expenses:
Cost of product and service sales	25,184	23,951
Service
Sales:
Net sales	111,908	103,899
Costs and expenses:
Cost of product and service sales	$ 61,094	$ 64,137