Condensed Consolidated Income Statements (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Royalties	$ 7,686,210	$ 6,555,647
Licensing revenues	4,409	12,344
Total Revenues	7,690,619	6,567,991
Costs and expenses:
Research and development	254,781	248,500
General and administrative	2,425,717	2,164,333
Total Cost and Expenses	2,680,498	2,412,833
Operating income	5,010,121	4,155,158
Other income:
Interest income	101,753	52,703
Other income	2,562	21,358
Total Other Income	104,315	74,061
Income before income tax expense	5,114,436	4,229,219
Provision for income tax expense	(1,769,683)	(1,400,095)
Net income	$ 3,344,753	$ 2,829,124
Basic net income per share (in dollars per share)	$ 0.47	$ 0.40
Diluted net income per share (in dollars per share)	$ 0.46	$ 0.39
Shares used in computation of basic net income per share (in shares)	7,164,248	7,011,664
Shares used in computation of diluted net income per share (in shares)	7,332,736	7,274,966