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Note 19 - Other Supplemental Information
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Additional Financial Information Disclosure [Text Block]
19.
Other supplemental information
 
    2016   2015   2014
             
Cash payments made during the year                        
Income taxes, net of refunds   $
36,349
     $
35,679
     $
34,904
  
Interest    
7,980
      
8,057
      
9,002
  
                         
Non-cash financing activities                        
Increases in capital lease obligations   $
988
     $
1,021
     $
2,581
  
Dividends declared but not paid    
1,932
      
1,540
      
3,581
  
                         
Other expenses                        
Rent expense   $
57,850
     $
52,561
     $
53,873