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Note 2 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Options exercise price (in dollars per share)   $ 65.75
Number of Shares Outstanding (in shares) 2,595,081  
Warrant [Member]    
Number of Shares Outstanding (in shares) 871,101 323,099
Average Exercise Price Outstanding (in dollars per share) $ 52.22 $ 128.40
Number of Shares Issued (in shares) 385,000 1,487,881
Average Exercise Price Issued (in dollars per share) $ 2.25 $ 0.71
Number of Shares Expired (in shares) (304)
Average Exercise Price Expired (in dollars per share) $ 281.95  
Number of Shares Exercised (in shares) (939,879)
Average Exercise Price Exercised (in dollars per share)
Number of Shares Outstanding (in shares) 1,255,797 871,101
Average Exercise Price Outstanding (in dollars per share) $ 36.84 $ 52.22
Employee Stock Option [Member]    
Number of Shares Outstanding (in shares) 165,643 31,350
Average Exercise Price Outstanding (in dollars per share) $ 11.22 $ 133.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 2,442,168 157,982
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.47 $ 3.14
Number of Shares Expired (in shares) (12,730) (22,377)
Average Exercise Price Expired (in dollars per share) $ 10.39 $ 122.13
Number of Shares Exercised (in shares) (1,312)
Options exercise price (in dollars per share) $ 65.75
Number of Shares Outstanding (in shares) 2,595,081 165,643
Average Exercise Price Outstanding (in dollars per share) $ 2.05 $ 11.22