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Note 3 - Summary of Significant Accounting Policies - Changes in Fair Value for Assets and Liabilities Measured on a Recurring Basis (Details) - Derivative Financial Instruments, Liabilities [Member]
6 Months Ended
Jun. 30, 2017
USD ($)
Balance, December 31, 2016 $ 516,870
Change in fair value of derivative warrants liabilities (12,544)
Balance, June 30, 2017 $ 504,326