Note 6 - Fair Value of Measurements (Details) - Assets and Liabilities at Fair Value on a Recurring Basis (USD $)	Sep. 30, 2014	Dec. 31, 2013
Assets:
Goodwill	$ 1,976,101
Recurring items as of September 30, 2014
Earnout milestone liability	13,877,659
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Short-term investments available for sale Bonds – corporate issuances	39,047,820	37,156,381
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Recurring items as of September 30, 2014
Common stock warrant liability	398,044	3,026
Earnout milestone liability	13,877,659
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
In-process research and development	25,801,728
Goodwill	1,976,101
Fair Value, Measurements, Recurring [Member]
Assets:
Short-term investments available for sale Bonds – corporate issuances	39,047,820	37,156,381
Recurring items as of September 30, 2014
Common stock warrant liability	398,044	3,026
Earnout milestone liability	13,877,659
Fair Value, Measurements, Nonrecurring [Member]
Assets:
In-process research and development	25,801,728
Goodwill	$ 1,976,101