v3.22.2.2
Note 6 - Warrants (Details Textual) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 01, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Public Warrants [Member]          
Class of Warrant or Right, Outstanding (in shares)   6,325,000      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1 1    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 11.50     $ 11.50
Class of Warrant or Right, Redemption Price Per Share (in dollars per share)   0.01 $ 0.01    
Threshold Closing Price for Specified Number of Trading Days (in dollars per share)   $ 21.00 $ 21.00    
Threshold Trading Days for Sale of Shares (Day)   20 days 20 days    
Threshold Consecutive Trading Days for Sale of Shares (Day)   30 days 30 days    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   126,268 126,268   6,325,000
Warrants and Rights Outstanding     $ 1,279,182    
Private Warrants [Member]          
Class of Warrant or Right, Outstanding (in shares)   556,313      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 11.50      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         556,313
Pre-Funded Warrant [Member]          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.0001        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 5,066,600   1,033,300 5,066,600  
Proceeds from Issuance of Warrants $ 19,000,000.0   $ 103    
Investor Warrant [Member]          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 0.75        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 4.125        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 6,900,000        
Proceeds from Issuance of Warrants     $ 98,378    
Class of Warrant or Right, Exercised During Period (in shares)   0 23,849