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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
Sep. 30, 2021
Dec. 31, 2020
Obligation under assessment arrangements $ 24,730 $ 26,246
Reported Value Measurement [Member]    
Obligation under assessment arrangements 21,005 22,062
Estimate of Fair Value Measurement [Member]    
Obligation under assessment arrangements $ 26,551 $ 26,542