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Note 4 - Derivative Instruments - Location and Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair value of derivative $ 207 $ 0  
Call Option [Member]      
Fair value of derivative 207 0 $ 572
Call Option [Member] | Prepaid Expenses and Other Current Assets [Member]      
Fair value of derivative [2] $ 207 [1] $ 0  
[1] Amounts are presented on a gross basis.
[2] The classification between current and noncurrent assets is based upon when the Call Options mature.