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Note 15 - Dividends and Dividend Equivalents (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Dividends Declared [Table Text Block]
   

Three Months Ended March 31,

 
   

2020

   

2019

 

Dividend declared per share

  $ 0.50     $ 0.40  

Total amount

  $ 22,317     $ 17,180