Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 9,597,408	$ 5,718,504
Investment securities – available for sale, at fair value	40,171,059	37,156,381
Accrued interest receivable on investment securities	291,147	212,048
Advances, deposits and other current assets	486,144	675,186
Total current assets	50,545,758	43,762,119
Property and equipment (at cost, less accumulated depreciation of $1,435,190 and $1,264,190, respectively)	850,995	832,886
Other assets:
Finite lived intangible assets, net	25,801,728
Total other assets	28,181,275	1,075,567
Goodwill	1,938,814
Deposits, deferred fees and other assets	423,858	1,054,942
Total assets	79,578,028	45,670,572
Current liabilities:
Accounts payable	3,616,864	1,452,436
Accrued liabilities	1,873,120	2,707,653
Notes payable – current portion	1,776,603	10,891
Deferred revenue – current portion	500,000	500,000
Total current liabilities	7,766,587	4,670,980
Earnout milestone liability	13,877,659
Common stock warrant liability	494,874	3,026
Notes payable, net of discounts	7,868,197	5,000,000
Deferred revenue	3,750,000	4,000,000
Other non-current liabilities	461,449	472,731
Total liabilities	34,218,766	14,146,737
Stockholders' equity:
Preferred stock, $0.01 par value: 100,000 shares authorized; no shares issued or outstanding at June 30, 2014 and December 31, 2013, respectively	0	0
Common stock, $0.01 par value; 75,000,000 shares authorized; 20,082,353 and 13,737,970 shares issued at June 30, 2014 and December 31, 2013, and 19,958,121 and 13,604,975 shares outstanding at June 30, 2014 and December 31, 2013, respectively	200,824	137,380
Additional paid-in capital	228,944,110	203,139,142
Accumulated other comprehensive loss	(11,829)	(44,166)
Accumulated deficit	(181,512,022)	(169,287,157)
Subtotal	47,621,083	33,945,199
Treasury stock, at cost (124,232 and 132,995 shares at June 30, 2014 and December 31, 2013, respectively)	(2,261,821)	(2,421,364)
Total stockholders' equity	45,359,262	31,523,835
Total liabilities and stockholders' equity	79,578,028	45,670,572
In Process Research and Development [Member]
Other assets:
Finite lived intangible assets, net	25,801,728
Patents [Member]
Other assets:
Finite lived intangible assets, net	$ 16,875	$ 20,625