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Note 5 - Stockholders' Equity, Stock Options and Warrants - Summary of Transactions for Stock Options and Warrants (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 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) 0 0
Average Exercise Price Forfeited (in dollars per share) $ 0 $ 0
Expired (in shares) (47,744) (25,233)
Average Exercise Price Expired (in dollars per share) $ 23.82 $ 10.00
Number of Shares Exercised (in shares)   (5,269,059)
Average Exercise Price Exercised (in dollars per share)   $ 0.86
Modified (in shares) (16,325,433)  
Modified (in dollars per share) $ 1.51  
Number of Shares Outstanding (in shares) 36,389,422 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) 16,410 147,230
Average Exercise Price Issued (in dollars per share) $ 0.49 $ 1.06
Number of Shares Forfeited (in shares) (11,897) (92,593)
Average Exercise Price Forfeited (in dollars per share) $ 1.09 $ 8.64
Expired (in shares) (45,760) 0
Expired (in dollars per share) $ 16.06 $ 0
Number of Shares Exercised (in shares)   (5,313)
Average Exercise Price Exercised (in dollars per share)   $ 0.74
Number of Shares Modified (in shares) 0  
Average Exercise Price Modified (in dollars per share) $ 0  
Number of Shares Outstanding (in shares) 1,021,624 1,062,871
Average Exercise Price Outstanding (in dollars per share) $ 4.45 $ 4.83