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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, 2022
Dec. 31, 2021
Obligation under assessment arrangements $ 23,738 $ 24,306
Reported Value Measurement [Member]    
Obligation under assessment arrangements 20,315 20,734
Estimate of Fair Value Measurement [Member]    
Obligation under assessment arrangements $ 26,581 $ 26,908