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Note 15 - Dividends and Dividend Equivalents (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Dividends Declared [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Dividend declared per share
   $
0.20
     $
0.20
     $
0.60
     $
0.60
  
Total amount declared
   $
8,301
     $
8,132
     $
24,822
     $
24,275