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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