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Note 6 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Warrant [Member]    
Number of Shares Outstanding (in shares) 7,353,376 2,171,610
Average Exercise Price Outstanding (in dollars per share) $ 3.76 $ 15.26
Number of Shares Issued (in shares) 29,640,801 8,097,468
Average Exercise Price Issued (in dollars per share) $ 1.44 $ 1.547
Number of Shares Forfeited (in shares) 0 (128,710)
Average Exercise Price Forfeited (in dollars per share) $ 0 $ 95.11
Number of Shares Exercised (in shares) (5,247,059) (2,786,992)
Average Exercise Price Exercised (in dollars per share) $ 0.86 $ 0.79
Number of Shares Outstanding (in shares) 31,747,118 7,353,376
Average Exercise Price Outstanding (in dollars per share) $ 2.077 $ 3.76
Share-based Payment Arrangement, Option [Member]    
Number of Shares Outstanding (in shares) 1,013,547 766,424
Average Exercise Price Outstanding (in dollars per share) $ 5.41 $ 11.34
Number of Shares Issued (in shares) 60,680 319,851
Average Exercise Price Issued (in dollars per share) $ 1.08 $ 1.03
Number of Shares Forfeited (in shares) (60,447) (72,728)
Average Exercise Price Forfeited (in dollars per share) $ 8.39 $ 10.58
Number of Shares Exercised (in shares) 0 0
Average Exercise Price Exercised (in dollars per share) $ 0 $ 0
Average Exercise Price Exercised (in dollars per share) $ 0 $ 0
Number of Shares Outstanding (in shares) 1,013,780 1,013,547
Average Exercise Price Outstanding (in dollars per share) $ 5.07 $ 5.41