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Note 16 - Dividends and Dividend Equivalents (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Dividends Declared [Table Text Block]
   
Three Months Ended March 31,
 
   
2019
   
2018
 
Dividend declared per share
  $
0.40
    $
0.30
 
Total amount
  $
17,180
    $
12,644