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Note 8 - Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Balance $ 3,085 $ 472
Additions to current period tax positions 1,170 2,616
Additions to prior period tax positions
Reductions to prior period tax provisions (3)
Balance $ 4,255 $ 3,085