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Note 9 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2016
   
2015
 
Provision (benefit) for income tax
  $ 9     $ (73 )
Effective income tax rate
    0.2 %     1.0 %