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Note 9 - Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-Current Deferred Tax Assets $ 32 $ 94
Non-Current Deferred Tax Liabilities (3,867) (5,538)
Net Deferred Tax Liabilities $ (3,835) $ (5,444)