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Note 3 - Stockholders' Equity (Deficit), Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares Outstanding (in shares) 2,764,983    
Options exercise price (in dollars per share)     $ 65.75
Number of Shares Outstanding (in shares) 3,448,885 2,764,983  
Warrant [Member]      
Number of Shares Outstanding (in shares) 1,951,257 871,101 323,099
Average Exercise Price Outstanding (in dollars per share) $ 23.74 $ 52.22 $ 128.40
Number of Shares Issued (in shares) 2,028,776 1,082,946 1,487,881
Average Exercise Price Issued (in dollars per share) $ 1.08 $ 1.49 $ 0.71
Number of Shares Expired (in shares) (10,706) (2,790)
Average Exercise Price Expired (in dollars per share) $ 199.55 $ 281.46
Number of Shares Exercised (in shares) (650,062) (939,879)
Average Exercise Price Exercised (in dollars per share) $ 1
Number of Shares Outstanding (in shares) 3,319,265 1,951,257 871,101
Average Exercise Price Outstanding (in dollars per share) $ 4.55 $ 23.74 $ 52.22
Employee Stock Option [Member]      
Number of Shares Outstanding (in shares) 2,764,983 165,643 31,350
Average Exercise Price Outstanding (in dollars per share) $ 2 $ 11.22 $ 133.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 836,950 2,612,070 157,982
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.12 $ 1.45 $ 3.14
Number of Shares Expired (in shares) (153,048) (12,730) (22,377)
Average Exercise Price Expired (in dollars per share) $ 2 $ 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) 3,448,885 2,764,983 165,643
Average Exercise Price Outstanding (in dollars per share) $ 1.78 $ 2 $ 11.22