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Note 3 - Income Tax (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months
Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
Effective tax rate
   
26.2
%    
36.5
%    
26.5
%    
32.0
%