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Note 17 - Interest Expense, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Other Nonoperating Expense, by Component [Table Text Block]
   
Year Ended December 31,
  
   
2018
   
2017
   
2016
 
   
(Dollars in thousands)
  
Interest related to sale of tax benefits
   $
11,284
     $
6,985
     $
9,349
  
Interest expense
    
63,368
      
54,381
      
61,327
  
Less — amount capitalized
    
(3,728
 )    
(7,224
 )    
(3,287
 )
    $
70,924
     $
54,142
     $
67,389