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Note 14 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 12, 2021
Mar. 31, 2021
Apr. 30, 2021
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year   $ 282  
Lessee, Operating Lease, Liability, to be Paid, Year One   $ 0  
Series C Convertible Preferred Stock [Member]      
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)   24,500  
Temporary Equity, Issued Price Per Share (in dollars per share)   $ 1,000  
Temporary Equity, Stock Issued During Period, Value, New Issues   $ 24,500  
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)   490  
Subsequent Event [Member] | Lease Agreement for Corporate Headquarters [Member]      
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year     $ 100
Lessee, Operating Lease, Liability, to be Paid, Year One     $ 700
Subsequent Event [Member] | Series C Warrants [Member]      
Exercise of Warrants, Percent of Fully Diluted Common Stock Acquirable 0.142%    
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) 10,000    
Temporary Equity, Issued Price Per Share (in dollars per share) $ 1,000    
Temporary Equity, Stock Issued During Period, Value, New Issues $ 10,000    
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares) 200