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Note 2 - Newly Adopted Accounting Pronouncements (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Operating Lease, Right-of-Use Asset $ 44.5 $ 46.6  
Operating Lease, Liability, Total $ 45.0    
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset     $ 44.8
Operating Lease, Liability, Total     $ 44.8