Condensed Consolidated Income Statements (unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Royalties	$ 6,531,107	$ 6,167,811	$ 14,217,317	$ 12,723,458
Licensing revenues	4,409	12,345	8,818	24,689
Total Revenues	6,535,516	6,180,156	14,226,135	12,748,147
Costs and expenses:
Research and development	337,731	444,477	592,512	692,977
General and administrative	2,315,283	1,902,083	4,741,000	4,066,416
Total Cost and Expenses	2,653,014	2,346,560	5,333,512	4,759,393
Operating income	3,882,502	3,833,596	8,892,623	7,988,754
Other income:
Interest income	140,995	67,327	242,748	120,030
Other income	23,423	9,836	25,985	31,194
Total Other Income	164,418	77,163	268,733	151,224
Income before income tax expense	4,046,920	3,910,759	9,161,356	8,139,978
Provision for income tax expense	(1,422,829)	(1,338,044)	(3,192,512)	(2,738,139)
Net income	$ 2,624,091	$ 2,572,715	$ 5,968,844	$ 5,401,839
Basic net income per share (in dollars per share)	$ 0.37	$ 0.37	$ 0.83	$ 0.77
Diluted net income per share (in dollars per share)	$ 0.36	$ 0.35	$ 0.81	$ 0.74
Shares used in computation of basic net income per share (in shares)	7,170,223	7,018,652	7,167,251	7,015,158
Shares used in computation of diluted net income per share (in shares)	7,329,118	7,268,527	7,330,875	7,272,328