Condensed Consolidated Income Statements (unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Royalties	$ 6,511,700	$ 6,119,815	$ 20,729,017	$ 18,843,273
Licensing revenues	4,408	762,345	13,226	787,034
Total Revenues	6,516,108	6,882,160	20,742,243	19,630,307
Costs and expenses:
Research and development	356,847	312,907	949,359	1,005,884
General and administrative	2,175,501	1,843,368	6,916,501	5,909,785
Total Cost and Expenses	2,532,348	2,156,275	7,865,860	6,915,669
Operating income	3,983,760	4,725,885	12,876,383	12,714,638
Other income:
Interest income	193,462	80,674	436,210	200,704
Other income	14,667	6,254	40,651	37,448
Total Other Income	208,129	86,928	476,861	238,152
Income before income tax expense	4,191,889	4,812,813	13,353,244	12,952,790
Provision for income tax expense	(1,477,057)	(1,759,220)	(4,669,569)	(4,497,359)
Net income	$ 2,714,832	$ 3,053,593	$ 8,683,675	$ 8,455,431
Basic net income per share (in dollars per share)	$ 0.38	$ 0.43	$ 1.21	$ 1.20
Diluted net income per share (in dollars per share)	$ 0.37	$ 0.42	$ 1.19	$ 1.16
Shares used in computation of basic net income per share (in shares)	7,164,934	7,062,543	7,166,470	7,031,068
Shares used in computation of diluted net income per share (in shares)	7,314,609	7,280,375	7,325,602	7,277,780