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Note 17 - Income Taxes (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

Three Months Ended September 30,

   

Nine Months Ended September 30,

 

(dollars in thousands)

 

2019

   

2018

   

2019

   

2018

 

Provision for (benefit from) income taxes

  $ 3,474     $ 8,692     $ (37,451 )   $ 7,357  
Effective tax rate     13.7 %     12.8 %     26.6 %     14.5 %