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Note 6 - Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Feb. 24, 2024
Mar. 31, 2024
Registered Direct Offering [Member]    
Legal Fees $ 282  
Common Stock [Member]    
Stock Issued During Period, Shares, New Issues (in shares)   929
Common Stock [Member] | Registered Direct Offering [Member]    
Stock Issued During Period, Shares, New Issues (in shares) 929  
Shares Issued, Price Per Share (in dollars per share) $ 35  
Proceeds from Issuance of Common Stock $ 32,500