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Note 21 - Other Supplemental Information
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Additional Financial Information Disclosure [Text Block]
21.
Other supplemental information
 
    2019     2018  
             
Cash payments made during the year                
Income tax, net of refunds   $
73,031
     $
42,153
  
Interest    
27,685
      
20,404
  
                 
Non-cash financing activities                
Increases (Decreases) in capital lease obligations   $
(616
 )   $
(522
 )
Dividends declared but not paid    
1,992
      
1,961
  
                 
Other expenses                
Rent expense   $
76,893
     $
74,183