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Note 12 - Fair Value Measurements (Details Textual)
$ / shares in Units, $ in Millions
4 Months Ended 6 Months Ended
Sep. 13, 2021
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Dec. 31, 2021
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) | $ / shares $ 1.00      
Class of Warrant or Right, Change in Exercise Price, Maximum Percentage of Five-day Volume Weighted Average Common Stock 110.00%      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Operating Lease, Fair Value In Excess Of Carrying Amount | $   $ 0.4 $ 0.4  
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 1.00
Warrant, Exercise Price, Increase (in dollars per share) | $ / shares   $ 0.10    
Fair Value Adjustment of Warrants | $     $ 0.2