Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues	$ 18,576	$ 17,814	$ 35,717	$ 32,647
Cost of revenues:
Total cost of revenues	9,059	9,062	17,836	17,127
Gross profit	9,517	8,752	17,881	15,520
Operating expense:
Selling, general and administrative	6,202	6,003	12,579	12,229
Research, development and engineering	1,505	1,735	3,102	3,193
Total operating expense	7,707	7,738	15,681	15,422
Operating income	1,810	1,014	2,200	98
Other income/(expense):
Investment income	4	77	64	268
Other (expense)/income	(4)	(3)	5	(4)
Interest expense	(1)	0	(1)	(13)
Total other (expense)/income	(1)	74	68	251
Income from continuing operations before income taxes	1,809	1,088	2,268	349
Income tax expense/(benefit)	440	247	579	(1,618)
Net income from continuing operations	1,369	841	1,689	1,967
Loss from discontinued operations, net of income tax of $464	0	0	(1,436)	0
Net income	1,369	841	253	1,967
Preferred stock dividend	0	90	0	173
Net income attributable to common stockholders	$ 1,369	$ 751	$ 253	$ 1,794
Net income per share from continuing operations:
Basic (in dollars per share)	$ 0.04	$ 0.03	$ 0.06	$ 0.07
Diluted (in dollars per share)	0.04	0.02	0.05	0.06
Net loss per share from discontinued operations:
Basic (in dollars per share)	0	0	(0.05)	0
Diluted (in dollars per share)	0	0	(0.04)	0
Net income per share attributable to common stockholders:
Basic (in dollars per share)	0.04	0.03	0.01	0.06
Diluted (in dollars per share)	$ 0.04	$ 0.02	$ 0.01	$ 0.05
Weighted average shares:
Basic (in shares)	30,589,249	28,246,840	30,484,797	28,143,534
Diluted (in shares)	32,466,122	33,650,790	32,494,950	33,588,951
Lightwave
Revenues:
Total revenues	$ 12,933	$ 12,523	$ 24,487	$ 22,041
Cost of revenues:
Total cost of revenues	5,181	5,334	10,066	9,613
Operating expense:
Operating income	1,168	491	1,145	(490)
Luna Labs
Revenues:
Total revenues	5,643	5,291	11,230	10,606
Cost of revenues:
Total cost of revenues	3,878	3,728	7,770	7,514
Operating expense:
Operating income	$ 642	$ 523	$ 1,055	$ 588