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Note 24 - Other Supplemental Information
 12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Additional Financial Information Disclosure [Text Block]
24.
Other supplemental information
 
    Year ended December 31,
      2020       2019  
                 
Cash payments made during the year                
Income tax, net of refunds   $
46,492
     $
73,031
  
Interest    
29,148
      
27,685
  
                 
Non-cash financing activities                
Dividends declared but not paid    
2,009
      
1,992
  
                 
Other expenses                
Rent expense   $
79,795
     $
76,893