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Note 11 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Jul. 23, 2024
Jul. 12, 2024
May 21, 2024
Registered Direct Offering [Member]      
Stock Issued During Period, Shares, New Issues (in shares)     220,000
Subsequent Event [Member] | July 2024 Pre-funded Warrants [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   626,368  
Stock Issued During Period, Shares, Warrant Exercise (in shares) 626,368    
Subsequent Event [Member] | July 2024 Common Warrants [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 2.86  
Subsequent Event [Member] | July 2024 Common Warrants [Member] | Maximum [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   2,170,000  
Subsequent Event [Member] | Registered Direct Offering [Member]      
Stock Issued During Period, Shares, New Issues (in shares)   458,632  
Subsequent Event [Member] | July 2024 Offering [Member]      
Proceeds from Issuance or Sale of Equity   $ 2.8