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Note 9 - Fair Value Measurements - Minimum Assessment Agreements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Obligation under assessment arrangements $ 18,494 $ 20,199
Note receivable   419
Reported Value Measurement [Member]    
Obligation under assessment arrangements 16,418 17,752
Note receivable   419
Estimate of Fair Value Measurement [Member]    
Obligation under assessment arrangements $ 21,221 23,282
Note receivable   $ 419