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Note 17 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Undistributed Earnings of Foreign Subsidiaries $ 68.8    
Deferred Tax Assets, Tax Credit Carryforwards, Total 3.6 $ 3.2  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 6.3 7.4  
Unrecognized Tax Benefits, Ending Balance 6.4 7.5 $ 5.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0.7 $ 0.6  
Domestic Tax Authority [Member]      
Deferred Tax Assets, Tax Credit Carryforwards, Total $ 2.2    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]      
Open Tax Year 2018 2017 2018 2019 2020    
Income Tax Examination, Year under Examination 2016 2017    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards, Total $ 40.9    
Operating Loss Carryforwards, Not subject to Expiration 18.9    
Operating Loss Carryforwards, Subject to Expiration $ 22.0    
Open Tax Year 2015 2016 2017 2018 2019 2020    
Foreign Tax Authority [Member] | Tax and Customs Administration, Netherlands [Member]      
Deferred Tax Assets, Tax Credit Carryforwards, Foreign $ 1.4    
State and Local Jurisdiction [Member]      
Open Tax Year 2015 2016 2017 2018 2019 2020