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Note 9 - Fair Value Considerations - Significant Assumptions (Details)
Dec. 31, 2020
Credit Risk Assumption [Member]  
Contingent consideration, measurement input 0.191
Contingent value rights, measurement input 0.096
Time Steps Per Year [Member]  
Contingent consideration, measurement input 1
Contingent value rights, measurement input 30
Sales Volatility [Member]  
Contingent consideration, measurement input 0.45
Number of Iterations [Member]  
Contingent consideration, measurement input 500
Contingent value rights, measurement input 10,000
Credit Spread [Member]  
Contingent consideration, measurement input 0.04