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Note 7 - Interest Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Other Nonoperating Expense, by Component [Table Text Block]
   
Three Months Ended March 31,
  
   
2017
   
2016
 
                 
Interest related to sale of tax benefits
   $
2,012
     $
858
  
Interest expense
    
14,175
      
15,625
  
Less
— amount capitalized
    
(1,264
 )    
(460
 )
    $
14,923
     $
16,023