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Note 5 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Apr. 15, 2025
Sep. 30, 2025
Dec. 31, 2024
Aug. 19, 2024
Restricted Cash and Cash Equivalent, Noncurrent   $ 710 $ 0  
Convertible Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage   13.00%   13.00%
Sublease Amendment [Member]        
Sublease Term Extension, Period (Year) 4 years      
Restricted Cash and Cash Equivalent, Noncurrent   $ 710    
Restricted Cash and Cash Equivalent, Current     $ 1,255