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Note 4 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Warrant [Member]    
Number of Shares Outstanding (in shares) 362,664 195,126
Average Exercise Price Outstanding (in dollars per share) $ 41.67 $ 237.40
Number of Shares Issued (in shares) 1,805,943 233,615
Average Exercise Price Issued (in dollars per share) $ 9.36 $ 10.67
Number of Shares Expired (in shares) (630) (1,071)
Average Exercise Price Expired (in dollars per share) $ 3,258.32 $ 1,995.53
Number of Shares Exercised (in shares) (59,700) (65,006)
Average Exercise Price Exercised (in dollars per share) $ 0.10 $ 10
Number of Shares Outstanding (in shares) 2,108,277 362,664
Average Exercise Price Outstanding (in dollars per share) $ 15.33 $ 41.67
Share-based Payment Arrangement, Option [Member]    
Number of Shares Outstanding (in shares) 366,928 276,498
Average Exercise Price Outstanding (in dollars per share) $ 17.03 $ 19.95
Number of Shares Issued (in shares) 366,120 109,886
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.12 $ 10.13
Number of Shares Expired (in shares) (19,484) (19,456)
Average Exercise Price Expired (in dollars per share) $ 14.73 $ 20
Number of Shares Exercised (in shares)
Average Exercise Price Exercised (in dollars per share)
Average Exercise Price Exercised (in dollars per share)
Number of Shares Outstanding (in shares) 713,564 366,928
Average Exercise Price Outstanding (in dollars per share) $ 11.84 $ 17.03