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Note 13 - Warrants and Options (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 200,648 $ 200,648
Non-Incentive Plan Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 21.46 $ 21.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 46,643 46,643
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0 $ 0
Warrants to Purchase Common Stock [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 404,676 404,676
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 11.12 $ 6.18
Warrants and Rights Outstanding, Remaining Contractual Term (Year) 1 year 6 months 3 years
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 6.29 $ 6.29
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 134.00 $ 134.00