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Note 14 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jul. 30, 2021
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2021
Series C Convertible Preferred Stock [Member]        
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)   10,000   24,500
Temporary Equity, Issued Price Per Share (in dollars per share)     $ 1,000 $ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues   $ 10.0 $ 24.5  
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)   200 490  
Subsequent Event [Member] | Series C Warrants [Member]        
Exercise of Warrants, Percent of Fully Diluted Common Stock Acquirable 0.071%      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.01      
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member]        
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares) 5,000      
Temporary Equity, Issued Price Per Share (in dollars per share) $ 1,000      
Temporary Equity, Stock Issued During Period, Value, New Issues $ 5.0      
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares) 100