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Note 17 - Other Supplemental Information (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Other Supplement Information [Table Text Block]
    2018     2017  
             
Cash payments made during the year                
Income tax, net of refunds   $
42,153
     $
43,374
  
Interest    
20,404
      
11,168
  
                 
Non-cash financing activities                
Increases (Decreases) in capital lease obligations   $
(522
 )   $
123
  
Dividends declared but not paid    
1,961
      
1,947
  
                 
Other expenses                
Rent expense   $
74,183
     $
65,982