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Note 12 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Summary of Income Tax Contingencies [Table Text Block]
Balance at January 1, 2016
  $ 1,924  
Increase to prior year tax positions
    95  
Increase to current year tax positions
    445  
Expiration of the statute of limitations for the assessment of taxes
     
Decrease related to settlements
     
Balance at March 31, 2016
  $ 2,464