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Note 5 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Shares Outstanding (in shares) 766,424  
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) 1,869,299 233,615
Average Exercise Price Issued (in dollars per share) $ 9.25 $ 10.67
Number of Shares Forfeited (in shares) (653) (1,071)
Average Exercise Price Forfeited (in dollars per share) $ 3,249.28 $ 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) 2,171,610 362,664
Average Exercise Price Outstanding (in dollars per share) $ 15.26 $ 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) 423,295 109,886
Average Exercise Price Issued (in dollars per share) $ 6.53 $ 10.13
Number of Shares Forfeited (in shares) (23,799) (19,456)
Average Exercise Price Forfeited (in dollars per share) $ 13.30 $ 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) 766,424 366,928
Average Exercise Price Outstanding (in dollars per share) $ 11.34 $ 17.03