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Note 4 - Acquisition (Details Textual) - USD ($)
3 Months Ended
Jan. 08, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Diffusion LLC [Member] | Former Equity Holders of Diffusion LLC [Member]        
Percentage of Common Stock Outstanding Owned 84.10%      
Diffusion LLC [Member] | Acquisition-related Costs [Member]        
Business Combination, Acquisition Related Costs   $ (1,644,768) $ 0  
Diffusion LLC [Member] | Success Fee Agreement Costs [Member]        
Payments for Other Fees $ 1,000,000      
Stock Issued During Period, Shares, Issued for Services 457,000      
Stock Issued During Period, Value, Issued for Services $ 487,500      
Diffusion LLC [Member]        
Business Combination, Number of Shares Called by Each Previously Held Unit of Membership Interest 3.652658      
Business Combination, Period Following Merger in Which Receipt of Cash for Discontinued Product Assets Would Trigger Contingent Value Right Payements 5 years      
Business Combination, Contingent Value Right Payout Maximum $ 50,000,000      
In Process Research and Development [Member]        
Impairment of Intangible Assets (Excluding Goodwill)   $ 0    
Executive Officers [Member]        
Severance Costs $ 3,000,000      
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001   $ 0.001
Goodwill, Impairment Loss   $ 0    
Stock Issued During Period, Shares, Issued for Services   456,427    
Stock Issued During Period, Value, Issued for Services   $ 487,500