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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Liabilities, Net, Total $ 463.9 $ 387.8  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 3.4 8.1 $ 8.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0.5 $ 3.9 $ 4.6
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0.6    
Open Tax Year 2017 2018 2019 2020 2021    
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]      
Income Tax Examination, Year under Examination 2013 2014 2015 2016 2017 2018    
State and Local Jurisdiction [Member] | Pennsylvania Department of Revenue [Member]      
Income Tax Examination, Year under Examination 2018 2019 2020