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Note 4 - Acquisition (Details Textual) - USD ($)
12 Months Ended
Jan. 08, 2016
Dec. 31, 2017
Dec. 31, 2016
Stock Issued During Period, Shares, Issued for Services   17,606 45,643
Stock Issued During Period, Value, Issued for Services   $ 50,000 $ 1,409,363
Share-based Compensation   1,240,551 1,391,068
Executive Officers [Member]      
Severance Costs $ 3,000,000 0  
RES-529 [Member]      
Intangible Assets, Net (Excluding Goodwill)   8,600,000  
RES-440 [Member]      
Intangible Assets, Net (Excluding Goodwill)   $ 1,000,000  
Diffusion LLC [Member]      
Business Combination, Number of Shares Called by Each Previously Held Unit of Membership Interest 0.3652658    
Business Combination, Period Following Merger in Which Receipt of Cash for Discontinued Product Assets Would Trigger Contingent Value Right Payements 5 years    
Diffusion LLC [Member] | Employee Stock Option [Member]      
Share-based Compensation $ 2,700,000    
Diffusion LLC [Member] | Financial Adviser [Member]      
Stock Issued During Period, Shares, Issued for Services 46,000    
Stock Issued During Period, Value, Issued for Services $ 500,000    
Diffusion LLC [Member] | Success Fee Agreement Costs [Member]      
Payments for Other Fees $ 1,100,000    
Diffusion LLC [Member] | Acquisition-related Costs [Member]      
Business Combination, Acquisition Related Costs     $ 1,600,000
Diffusion LLC [Member] | Former Equity Holders of Diffusion LLC [Member]      
Percentage of Common Stock Outstanding Owned 84.10%