Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenues	$ 17,141	$ 14,833
Cost of revenues:
Total cost of revenues	8,777	8,065
Gross profit	8,364	6,768
Operating expense:
Selling, general and administrative	6,377	6,207
Research, development and engineering	1,597	1,458
Total operating expense	7,974	7,665
Operating income/(loss)	390	(897)
Other income/(expense):
Investment income	59	171
Other income/(expense)	9	(2)
Interest expense	0	(11)
Total other income	68	158
Income/(loss) from continuing operations before income taxes	458	(739)
Income tax expense/(benefit)	138	(1,865)
Net income from continuing operations	320	1,126
Loss from discontinued operations, net of income tax of $464	(1,436)	0
Net (loss)/income	(1,116)	1,126
Preferred stock dividend	0	83
Net (loss)/income attributable to common stockholders	$ (1,116)	$ 1,043
Net income per share from continuing operations:
Basic (in dollars per share)	$ 0.01	$ 0.04
Diluted (in dollars per share)	0.01	0.03
Net loss per share from discontinued operations:
Basic (in dollars per share)	(0.05)	0.00
Diluted (in dollars per share)	(0.04)	0.00
Net (loss)/income per share attributable to common stockholders:
Basic (in dollars per share)	(0.04)	0.04
Diluted (in dollars per share)	$ (0.03)	$ 0.03
Weighted average shares:
Basic (in shares)	30,380,345	28,039,080
Diluted (in shares)	32,549,487	33,479,935
Products and licensing
Revenues:
Total revenues	$ 10,326	$ 8,192
Cost of revenues:
Total cost of revenues	3,862	3,249
Technology development
Revenues:
Total revenues	6,815	6,641
Cost of revenues:
Total cost of revenues	$ 4,915	$ 4,816