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Note 12 - Mezzanine Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Temporary Equity, Carrying Amount, Attributable to Parent $ 13,517 $ 13,517
Series E Preferred Stock [Member]    
Stock Redeemed or Called During Period, Shares (in shares) 0  
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 1.30  
Temporary Equity, Shares Outstanding (in shares) 11,264 11,264
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 8,664,615  
Temporary Equity, Carrying Amount, Attributable to Parent $ 13,517 $ 13,517
Preferred Stock, Shares Issued, Total (in shares) 0