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Note 4 - Acquisition (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jan. 08, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation       $ 681,449 $ 731,633
Executive Officers [Member]          
Severance Costs $ 3,000,000 $ 0 $ 0 0  
Diffusion LLC [Member] | Employee Stock Option [Member]          
Share-based Compensation 2,700,000 $ 0 $ 0 $ 0  
Diffusion LLC [Member] | Success Fee Agreement Costs [Member]          
Payments for Other Fees $ 1,100,000        
Stock Issued During Period, Shares, Issued for Services 46,000        
Stock Issued During Period, Value, Issued for Services $ 500,000        
Diffusion LLC [Member] | Acquisition-related Costs [Member]          
Business Combination, Acquisition Related Costs         $ 1,600,000