Consolidated Statements of Operations (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Net sales	$ 37,458	$ 18,219	$ 21,998
Royalties	11,767,758	9,155,654	6,314,959
Licensing revenue	2,662,024	1,971,205	5,012,102
Consulting fees	0	0	46,667
Total revenues	14,467,240	11,145,078	11,395,726
Costs and expenses:
Research and development	1,484,416	1,249,755	972,078
General and administrative	5,038,363	4,774,828	5,231,881
Total costs and expenses	6,522,779	6,024,583	6,203,959
Operating income	7,944,461	5,120,495	5,191,767
Other income (expense):
Interest income	26,202	34,634	55,780
Other	0	0	15,823
Total other income (expense)	26,202	34,634	71,603
Income before benefit (expense) for income tax	7,970,663	5,155,129	5,263,370
Income tax benefit (expense)	(2,684,816)	(2,174,054)	1,338,256
Net income	$ 5,285,847	$ 2,981,075	$ 6,601,626
Basic net income per share (in dollars per share)	$ 0.83	$ 0.47	$ 1.04
Diluted net income per share (in dollars per share)	$ 0.76	$ 0.43	$ 0.95
Shares used in computation of basic net income per share (in shares)	6,345,615	6,351,245	6,340,648
Shares used in computation of diluted net income per share (in shares)	6,922,274	6,981,527	6,952,386