Condensed Consolidated Income Statements (unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Royalties	$ 6,119,815	$ 5,277,494	$ 18,843,273	$ 15,574,234
Licensing revenues	762,345	1,012,345	787,034	1,037,034
Total Revenues	6,882,160	6,289,839	19,630,307	16,611,268
Costs and expenses:
Research and development	312,907	258,837	1,005,884	755,038
General and administrative	1,843,368	1,709,044	5,909,785	5,307,431
Total Cost and Expenses	2,156,275	1,967,881	6,915,669	6,062,469
Operating income	4,725,885	4,321,958	12,714,638	10,548,799
Other income:
Interest income	80,674	26,744	200,704	58,946
Other income	6,254	1,477	37,448	6,110
Total other income	86,928	28,221	238,152	65,056
Income before income tax expense	4,812,813	4,350,179	12,952,790	10,613,855
Provision for income tax expense	(1,759,220)	(1,479,200)	(4,497,359)	(3,654,772)
Net income	$ 3,053,593	$ 2,870,979	$ 8,455,431	$ 6,959,083
Basic net income per share (in dollars per share)	$ 0.43	$ 0.42	$ 1.20	$ 1.02
Diluted net income per share (in dollars per share)	$ 0.42	$ 0.39	$ 1.16	$ 0.96
Shares used in computation of basic net income per share (in shares)	7,062,543	6,892,637	7,031,068	6,797,506
Shares used in computation of diluted net income per share (in shares)	7,280,375	7,316,287	7,277,780	7,259,338