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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]
12 Months Ended
Dec. 31, 2016
USD ($)
Balance, December 31, 2015
Issuance of derivative warrants liabilities 487,425
Change in fair value of derivative warrants liabilities 29,445
Balance, December 31, 2016 $ 516,870