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Note 13 - Warrants (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended
Dec. 15, 2020
Jul. 31, 2020
Dec. 31, 2020
Class of Warrant or Right, Issued During Period (in shares)     403,760
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, 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  
December 15, 2020 Offering [Member]      
Class of Warrant or Right, Issued During Period (in shares) 311,458    
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) $ 7.50    
Warrants and Rights Outstanding $ 1,300,000