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Note 18 - Other Supplemental Information
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Additional Financial Information Disclosure [Text Block]
18.
Other supplemental information
 
      2017       2016  
         
Cash payments made during the period                
Income taxes, net of refunds   $
43,374
     $
36,349
  
Interest    
11,168
      
7,980
  
                 
Non-cash financing activities                
Increases in capital lease obligations   $
123
     $
988
  
Dividends declared but not paid    
1,947
      
1,932
  
                 
Other expenses                
Rent expense   $
65,982
     $
57,850