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Note 8 - Convertible Debt (Details Textual) - USD ($)
3 Months Ended 12 Months Ended 73 Months Ended
Sep. 27, 2016
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 08, 2016
Interest Expense     $ 100,000 $ 37,000    
Interest Payable     37,000 29,000    
Litigation Settlement, Expense     2,500,000    
Repayments of Convertible Debt     1,880,000    
Interest Paid, Net     112,800    
Convertible Notes Payable     550,000 2,430,000    
Debt Conversion, Original Debt, Amount       700,000    
Debt Conversion, Converted Instrument, Related Accrued Interest       16,000    
Diffusion LLC [Member]            
Convertible Notes Payable           $ 1,100,000
The 2016 Convertible Notes [Member]            
Repayments of Convertible Debt   $ 1,900,000        
Interest Paid, Net   $ 100,000        
Convertible Notes Payable     1,880,000    
The 2016 Convertible Notes [Member] | Settlement Agreement [Member]            
Debt Instrument, Face Amount $ 1,900,000          
Debt Instrument, Term 1 year          
Debt Instrument, Interest Rate, Stated Percentage 6.00%          
Litigation Settlement, Expense $ 2,500,000          
Convertible Notes [Member]            
Proceeds from Issuance of Unsecured Debt         $ 22,400,000  
Debt Instrument, Interest Rate, Effective Percentage     1.00%      
Qualified Financing, Minimum Amount of Gross Proceeds     $ 50,000,000      
Convertible Notes Payable     $ 550,000 $ 550,000    
Debt Conversion, Converted Instrument, Shares Issued       217,122    
Convertible Notes [Member] | Minimum [Member]            
Debt Instrument, Interest Rate, Stated Percentage         1.00%  
Convertible Notes [Member] | Maximum [Member]            
Debt Instrument, Interest Rate, Stated Percentage         1.50%