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Note 4 - Stockholders' Equity (Deficit), Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Shares Outstanding (in shares) 3,669,277  
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) 2,336,154 1,082,946
Average Exercise Price Issued (in dollars per share) $ 1.07 $ 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) (650,062)
Average Exercise Price Exercised (in dollars per share) $ 1
Number of Shares Outstanding (in shares) 3,626,643 1,951,257
Average Exercise Price Outstanding (in dollars per share) $ 4.17 $ 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 1,098,858 2,612,070
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 1.01 $ 1.45
Number of Shares Expired (in shares) (194,564) (12,730)
Average Exercise Price Expired (in dollars per share) $ 2 $ 10.39
Number of Shares Exercised (in shares)
Average Exercise Price Exercised (in dollars per share)
Number of Shares Outstanding (in shares) 3,669,277 2,764,983
Average Exercise Price Outstanding (in dollars per share) $ 1.70 $ 2