Note 6 - Fair Value of Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Total Fair Value on the Balance Sheet		Quoted Prices In Active Markets For Identical Assets /Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Recurring items as of June 30, 2014
Short-term investments available for sale Bonds – corporate issuances	$	40,171,059	$	40,171,059	$	─	$	─
Non-recurring items as of June 30, 2014
In-process research and development	$	25,801,728	$	─	$	─	$	25,801,728
Goodwill	$	1,938,814	$	─	$	─	$	1,938,814
Recurring items as of December 31, 2013
Short-term investments available for sale Bonds – corporate issuances	$	37,156,381	$	37,156,381	$	─	$	─
Liabilities:
Recurring items as of June 30, 2014
Common stock warrant liability	$	494,874	$	─	$	─	$	494,874
Earnout milestone liability	$	13,877,659	$	─	$	─		13,877,659
As of December 31, 2013
Common stock warrant liability	$	3,026	$	─	$	─	$	3,026