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Note 10 - Stockholders' Equity - Summary of Warrants (Details) - $ / shares
Jun. 30, 2020
Jun. 26, 2020
Jun. 20, 2020
Jan. 31, 2020
Series G Warrants [Member]        
Exercise price (in dollars per share) $ 0.50   $ 0.50 $ 25,440
Number of warrants (in shares) 48      
Series H Warrants [Member]        
Exercise price (in dollars per share) $ 0.50   0.50 1.15
Number of warrants (in shares) 217,392      
Series I Warrants [Member]        
Exercise price (in dollars per share) $ 0.50   $ 0.50 $ 15,000
Number of warrants (in shares) 1,500,000      
June 2020 Warrants [Member]        
Exercise price (in dollars per share) $ 0.50 $ 0.50    
Number of warrants (in shares) 2,400,000