CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Total revenues	$ 70,515,715	$ 42,917,245
Cost of revenues:
Total cost of revenues	35,333,333	23,479,345
Gross profit	35,182,382	19,437,900
Operating expense:
Selling, general and administrative	24,371,349	14,794,205
Research, development and engineering	7,496,012	3,766,160
Total operating expense	31,867,361	18,560,365
Operating income	3,315,021	877,535
Other income/(expense):
Other expense, net	(4,504)	(17,143)
Investment income	393,556	549,580
Interest expense, net	(15,878)	(124,344)
Total other income	373,174	408,093
Income from continuing operations before income taxes	3,688,195	1,285,628
Income tax benefit/(expense)	1,654,350	(47,818)
Net income from continuing operations	5,342,545	1,237,810
Operating income from discontinued operations, net of income tax expenses ($183,921)		1,170,634
Gain on sale, net of income tax expenses ($1,572,244)	0	8,595,798
Net income from discontinued operations	0	9,766,431
Net income	5,342,545	11,004,241
Less: Preferred stock dividend	285,450	257,302
Net income attributable to common stockholders	$ 5,057,095	$ 10,746,939
Net income per share from continuing operations:
Basic (in dollars per share)	$ 0.19	$ 0.04
Diluted (in dollars per share)	0.17	0.04
Net income per share from discontinued operations:
Basic (in dollars per share)	0.00	0.35
Diluted (in dollars per share)	0.00	0.30
Net income per share attributable to common stockholders:
Basic (in dollars per share)	0.18	0.39
Diluted (in dollars per share)	$ 0.16	$ 0.33
Weighted average shares:
Basic (in shares)	28,688,867	27,596,401
Diluted (in shares)	31,840,584	32,452,228
Products and licensing
Cost of revenues:
Total cost of revenues	$ 16,684,172	$ 8,078,870
Technology development
Cost of revenues:
Total cost of revenues	$ 18,649,161	$ 15,400,475