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Note 4 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Number of Shares Outstanding (in shares) 3,120,255  
Warrant [Member]    
Number of Shares Outstanding (in shares) 1,951,257 871,101
Average Exercise Price Outstanding (in dollars per share) $ 23.74 $ 52.22
Number of Shares Issued (in shares) 957,000 1,082,946
Average Exercise Price Issued (in dollars per share) $ 1 $ 1.49
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) (341,169)
Average Exercise Price Exercised (in dollars per share) $ 1
Number of Shares Outstanding (in shares) 2,556,382 1,951,257
Average Exercise Price Outstanding (in dollars per share) $ 5.97 $ 23.74
Employee Stock Option [Member]    
Number of Shares Outstanding (in shares) 2,764,983 165,643
Average Exercise Price Outstanding (in dollars per share) $ 2 $ 11.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 482,402 2,612,070
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.11 $ 1.45
Number of Shares Expired (in shares) (127,130) (12,730)
Average Exercise Price Expired (in dollars per share) $ 2.22 $ 10.39
Number of Shares Exercised (in shares)
Average Exercise Price Exercised (in dollars per share)
Number of Shares Outstanding (in shares) 3,120,255 2,764,983
Average Exercise Price Outstanding (in dollars per share) $ 1.85 $ 2