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Note 3 - Derivative Instruments - Location and Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair value of derivative $ 236 [1]   $ 0      
Call Option [Member]            
Fair value of derivative 236 $ 329 0 $ 32 $ 81 $ 572
Call Option [Member] | Prepaid Expenses and Other Current Assets [Member]            
Fair value of derivative [2] 236 [1]   0      
Call Option [Member] | Operating Lease Right of Use Asset and Other Assets Noncurrent [Member]            
Fair value of derivative [2] $ 0 [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.