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Note 5 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Warrant [Member]    
Number of Shares Outstanding (in shares) 31,699,885 7,353,376
Average Exercise Price Outstanding (in dollars per share) $ 1.66 $ 1.99
Number of Shares Issued (in shares) 21,062,714 29,640,801
Average Exercise Price Issued (in dollars per share) $ 0.70 $ 1.44
Number of Shares Forfeited (in shares) (38,640) 0
Average Exercise Price Forfeited (in dollars per share) $ 0 $ 0
Expired (in shares) (16,325,433) (25,233)
Average Exercise Price Expired (in dollars per share) $ 26.91 $ 10.00
Number of Shares Exercised (in shares)   (5,269,059)
Average Exercise Price Exercised (in dollars per share)   $ 0.86
Number of Shares Outstanding (in shares) 36,398,526 31,699,885
Average Exercise Price Outstanding (in dollars per share) $ 0.74 $ 1.66
Share-Based Payment Arrangement, Option [Member]    
Number of Shares Outstanding (in shares) 1,062,871 1,013,547
Average Exercise Price Outstanding (in dollars per share) $ 4.83 $ 5.41
Number of Shares Issued (in shares) 14,075 147,230
Average Exercise Price Issued (in dollars per share) $ 0.51 $ 1.06
Number of Shares Forfeited (in shares) 0 (92,593)
Average Exercise Price Forfeited (in dollars per share) $ 0 $ 8.64
Expired (in shares) (41,701) 0
Expired (in dollars per share) $ 13.41 $ 0
Number of Shares Exercised (in shares)   (5,313)
Average Exercise Price Exercised (in dollars per share)   $ 0.74
Number of Shares Outstanding (in shares) 1,035,245 1,062,871
Average Exercise Price Outstanding (in dollars per share) $ 4.49 $ 4.83