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Note 7 - Interest Expense, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Other Nonoperating Expense, by Component [Table Text Block]
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
   
2018
   
2017
   
2018
   
2017
 
                                 
Interest related to sale of tax benefits
   $
2,916
     $
1,607
     $
6,086
     $
5,468
  
Interest expense
    
16,571
      
13,299
      
45,298
      
41,620
  
Less — amount capitalized
    
(787
 )    
(3,214
 )    
(2,494
 )    
(5,933
 )
    $
18,700
     $
11,692
     $
48,890
     $
41,155