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Note 15 - Dividends and Dividend Equivalents (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Dividends Declared [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Dividend declared per share
   $
0.30
     $
0.20
     $
0.60
     $
0.40
  
Total amount
   $
12,686
     $
8,273
     $
25,330
     $
16,521