Condensed Consolidated Income Statements - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total Revenues	$ 3,903,402	$ 8,852,986	$ 13,572,069	$ 16,982,127
Costs and expenses:
Research and development	160,461	161,321	282,431	310,857
General and administrative	3,993,861	1,728,125	7,161,907	4,635,284
Restructuring charges			1,146,045
Total Costs and Expenses	4,154,322	1,889,446	8,590,383	4,946,141
Operating income	(250,920)	6,963,540	4,981,686	12,035,986
Other income:
Interest income	390,888	517,156	870,597	966,580
Income before income tax expense	139,968	7,480,696	5,852,283	13,002,566
Provision for income tax expense	(24,172)	(1,054,236)	(1,237,681)	(2,159,511)
Net income	$ 115,796	$ 6,426,460	$ 4,614,602	$ 10,843,055
Basic net income per share (in dollars per share)	$ 0.02	$ 0.88	$ 0.63	$ 1.49
Diluted net income per share (in dollars per share)	$ 0.02	$ 0.87	$ 0.63	$ 1.48
Shares used in computation of basic net income per share (in shares)	7,337,460	7,308,268	7,337,564	7,292,663
Shares used in computation of diluted net income per share (in shares)	7,361,764	7,349,696	7,361,256	7,344,008
Royalties
Revenues:
Total Revenues	$ 3,903,402	$ 8,852,986	$ 13,572,069	$ 16,982,127