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Note 15 - Dividends and Dividend Equivalents (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Dividends Declared [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Dividend declared per share
   $
0.30
     $
0.20
     $
0.90
     $
0.60
  
Total amount
   $
12,722
     $
8,301
     $
38,052
     $
24,822