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Note 8 - Fair Value Measurements - Minimum Assessment Agreements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Obligation under assessment arrangements $ 19,586 $ 20,199
Note receivable   419
Reported Value Measurement [Member]    
Obligation under assessment arrangements 17,267 17,752
Note receivable   419
Estimate of Fair Value Measurement [Member]    
Obligation under assessment arrangements $ 22,670 23,282
Note receivable   $ 419