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Note 9 - Fair Value Measurements - Minimum Assessment Agreements (Details) - Fair Value, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Note receivable $ 32,498 $ 118,162
Obligation under assessment arrangements 20,659 22,293
Reported Value Measurement [Member]    
Note receivable 32,498 83,791
Obligation under assessment arrangements 18,079 19,304
Estimate of Fair Value Measurement [Member]    
Note receivable 32,498 82,338
Obligation under assessment arrangements $ 23,835 $ 25,738