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Note 10 - Fair Value Measurements - Minimum Assessment Agreements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Obligation under assessment arrangements $ 29,878 $ 29,943
Reported Value Measurement [Member]    
Obligation under assessment arrangements 24,735 24,477
Estimate of Fair Value Measurement [Member]    
Obligation under assessment arrangements $ 28,609 $ 29,591