Note 6 - Fair Value of Measurements (Details) - Assets and Liabilities at Fair Value on a Recurring Basis (USD $)	Jun. 30, 2014	Dec. 31, 2013
Assets:
Short-term investments available for sale Bonds – corporate issuances	$ 40,171,059	$ 37,156,381
Non-recurring items as of June 30, 2014
In-process research and development	25,801,728
Goodwill	1,938,814
Recurring items as of June 30, 2014
Common stock warrant liability	494,874	3,026
Earnout milestone liability	13,877,659
Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments available for sale Bonds – corporate issuances	40,171,059	37,156,381
Fair Value, Inputs, Level 3 [Member]
Non-recurring items as of June 30, 2014
In-process research and development	25,801,728
Goodwill	1,938,814
Recurring items as of June 30, 2014
Common stock warrant liability	494,874	3,026
Earnout milestone liability	$ 13,877,659