Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Net sales	$ 32,432	$ 37,458	$ 18,219
Royalties	12,985,370	11,767,758	9,155,654
Licensing revenue	1,059,254	2,662,024	1,971,205
Total revenues	14,077,056	14,467,240	11,145,078
Costs and expenses:
Research and development	1,263,512	1,484,416	1,249,755
General and administrative	5,814,185	5,038,363	4,774,828
Total costs and expenses	7,077,697	6,522,779	6,024,583
Operating income	6,999,359	7,944,461	5,120,495
Other income:
Interest income	32,158	26,202	34,634
Other	1,150	0	0
Total other income (expense)	33,308	26,202	34,634
Income before income tax	7,032,667	7,970,663	5,155,129
Income tax provision	(2,386,707)	(2,684,816)	(2,174,054)
Net income	$ 4,645,960	$ 5,285,847	$ 2,981,075
Earnings per common share:
Basic (in dollars per share)	$ 0.72	$ 0.83	$ 0.47
Diluted (in dollars per share)	$ 0.66	$ 0.76	$ 0.43
Shares used in calculation of net income per common share:
Basic (in shares)	6,477,457	6,345,615	6,351,245
Diluted (in shares)	7,079,570	6,922,274	6,981,527