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Note 5 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Current Income Tax Expense (Benefit) $ 0 $ 0
Unrecognized Tax Benefits 0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 0 $ 0