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Note 3 - Summary of Significant Accounting Policies - Weighted Average Assumptions (Details) - $ / shares
6 Months Ended 12 Months Ended
Feb. 12, 2016
Jun. 30, 2017
Dec. 31, 2016
Dividend yield   0.00%  
Derivative Financial Instruments, Liabilities [Member]      
Exercise price (in dollars per share) $ 1.25 $ 1.25 $ 1.25
Risk free interest rate 1.20% 1.89% 1.93%
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 156.00% 258.40% 219.00%
Contractual term (in years) (Year) 5 years 3 years 182 days 4 years 91 days