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Note 13 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended March 31,
 
   
2019
   
2018
 
Income tax expense
  $
3
    $
6
 
Effective income tax rate
   
(20
%)    
23
%