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Note 11 - Capital Structure (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 10, 2020
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Common Stock, Shares Authorized (in shares)     200,000,000 200,000,000   200,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.0001 $ 0.0001   $ 0.0001  
Preferred Stock, Shares Authorized (in shares)     50,000,000 50,000,000   50,000,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.0001 $ 0.0001   $ 0.0001  
Common Stock, Shares, Outstanding, Ending Balance (in shares)     12,583,736 17,882,893   17,882,893  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)     0 0   0  
Stock Issued During Period, Value, New Issues       $ 28,317,444      
Payments of Stock Issuance Costs           $ 4,292,781 $ 741,650
Class of Warrant or Right, Issued During Period (in shares)           403,760  
Wainwright [Member]              
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001            
Stock Issued During Period, Shares, New Issues (in shares) 4,791,667            
Underwriting Agreement, Commitment Offering, Shares (in shares) 4,166,667            
Shares Issued, Price Per Share (in dollars per share) $ 6            
Underwriting Agreement, Overallotment Option, Shares (in shares) 625,000            
Conversion of Debt to Common Stock [Member]              
Debt Conversion, Original Debt, Amount $ 800,000            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 130,081            
Warrants Issued in Connection with March Offerings [Member]              
Class of Warrant or Right, Issued During Period (in shares)   92,302          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   92,302          
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share)   $ 15.99          
Warrants and Rights Outstanding, Term (Year)   1 year          
Warrants and Rights Outstanding   $ 356,000          
Warrants Issued in Connection With Wainwright Offering [Member]              
Class of Warrant or Right, Issued During Period (in shares) 311,458            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 311,458            
Warrants and Rights Outstanding, Term (Year) 5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 7.50            
At-the-market Offering [Member]              
Stock Issued During Period, Shares, New Issues (in shares)     430,230 352,912 0    
Stock Issued During Period, Value, New Issues     $ 6,800,000 $ 3,600,000      
Payments of Stock Issuance Costs     $ 200,000 $ 100,000      
The March Offerings [Member]              
Payments of Stock Issuance Costs   $ 1,500,000          
Restricted Stock [Member]              
Common Stock, Shares, Outstanding, Ending Balance (in shares)       365,869   365,869