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Note 13 - Fair Value Measurements (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended
Sep. 13, 2021
$ / shares
shares
Mar. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Exercise Price [Member]      
Warrants and Rights Outstanding, Measurement Input   1.00 1.00
Warrant, Exercise Price, Increase (in dollars per share)   $ 0.10  
Fair Value Adjustment of Warrants | $   $ 151  
Warrant A [Member] | Derivative Financial Instruments, Liabilities [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 2,307,693    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.00    
Class of Warrant or Right, Change in Exercise Price, Maximum Percentage of Five-day Volume Weighted Average Common Stock 110.00%