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Note 13 - Subsequent Events (Details Textual) - USD ($)
Mar. 24, 2021
Mar. 24, 2021
Feb. 26, 2021
Jan. 06, 2021
May 21, 2020
Dec. 31, 2020
Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares)         1,085,000    
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001 $ 0.001 $ 0.001
Subsequent Event [Member] | March 2021 Purchase Agreement [Member]              
Stock Issued During Period, Shares, New Issues (in shares) 80,000            
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001 $ 0.001          
Debt Instrument, Purchase Price Upon the Satisfaction of Conditions in the Agreement, Amount   $ 15,000,000          
Subsequent Event [Member] | Senior Convertible Note Due in 2023 [Member]              
Debt Instrument, Face Amount $ 15,000,000 $ 15,000,000          
Board of Directors Chairman [Member] | Subsequent Event [Member]              
Stock Issued During Period, Shares, Issued for Services (in shares)       11,218      
Stock Issued During Period, Value, Issued for Services       $ 70,000      
Management [Member] | Subsequent Event [Member]              
Stock Issued During Period, Shares, Issued for Services (in shares)     30,694        
Stock Issued During Period, Value, Issued for Services     $ 166,667