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Note 3 - Summary of Significant Accounting Policies - Assets Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Reported Value Measurement [Member]    
Derivative warrants liabilities $ 516,987 $ 516,870
Estimate of Fair Value Measurement [Member]    
Derivative warrants liabilities 516,987 516,870
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative warrants liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivative warrants liabilities
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative warrants liabilities $ 516,987 $ 516,870