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Note 7 - Net Loss Per Share - Schedule of Antidilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Share-Based Payment Arrangement, Option [Member]    
Antidilutive Securities (in shares) 250 250
Convertible Series F Preferred Stock [Member]    
Antidilutive Securities (in shares) [1],[2] 164,857 1,507,155
Series F Preferred Warrants [Member]    
Antidilutive Securities (in shares) [3],[4] 2,784,921 2,932,486
Common Stock Warrants [Member]    
Antidilutive Securities (in shares) 2,345,603 113,623
[1] Calculation assumes conversion of the stated value, and accrued dividends, of the Series F Preferred Stock into Common Stock at the Floor Price as of June 30, 2024, and at the initial conversion price of $1.71 as of June 30, 2023.
[2] Calculation assumes conversion of the stated value, and accrued dividends, of the Series F Preferred Stock into Common Stock at the Floor Price of $11.17 as of September 30, 2024, and at the initial conversion price of $68.40 as of September 30, 2023.
[3] Calculation assumes exercise of the Series F Preferred Warrants for cash into Series F Preferred Stock and subsequent conversion of the Series F Preferred Stock into Common Stock at the Floor Price as of June 30, 2024 and at the initial conversion price of $1.71 as of June 30, 2023.
[4] Calculation assumes exercise of the Series F Preferred Warrants for cash into Series F Preferred Stock and subsequent conversion of the Series F Preferred Stock into Common Stock at the Floor Price of $11.17 per share as of September 30, 2024 and at the initial conversion price of $68.40 as of September 30, 2023.