XML 36 R25.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 10 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended March 31,
 
   
2018
   
2017
 
Income tax expense
  $
6,400
    $
7,329
 
Effective income tax rate
   
24.3
%    
41.1
%