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Note 6 - Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Stock by Class [Table Text Block]
  

Series F Preferred

  

Accrued

  

Weighted Average

  

Common Shares Issued

 
  

Stock Shares

  

Dividends

  

Conversion Price

  

from Conversions

 

Balance on December 31, 2023

  1,930  $131,000       352,624 

2024 Issuance

  1,648            

2024 Accrued Dividends

      89,000         

2024 Conversions

  (3,033)  (191,000) $11.17   288,968 

Balance on December 31, 2024

  545   29,000       641,592 

2025 Issuance

  575            

2025 Accrued Dividends

      32,000         

2025 Conversions

  (970)  (39,000) $3.77   257,617 

Balance on December 31, 2025

  150  $22,000  $3.77   899,209 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issue Date

 

Warrants Issued

  

Exercise Price

 

Expiration Date

Q1 2023 Common Warrants

  1,206,049  $3.41 

Q3 2028

Q1 2023 Placement Agent Warrants

  153,470  $3.41 

Q3 2028

Q2 2024 Common Warrants

  390,959  $3.41 

Q4 2029

Q2 2025 Advisor Warrants

  100,000  $3.77 

Q2 2028

Q2 2025 Placement Agent Warrants

  99,470  $4.71 

Q2 2030

Q2 2025 Pre-Funded Warrants (1)

  586,261  $3.77 

Q2 2030

Q3 2025 Common Warrants

  152,519  $3.77 

Q1 2030

   2,688,728      
  

Outstanding

 
  

Number of Warrants

  

Weighted Average Exercise Price

 

Warrants outstanding and exercisable, December 31, 2023

  103,453  $69.03 

Granted

  24,104   68.40 

Make-whole provision

  2,426,986   3.41 

Exercised

  (282,314)  3.41 

Expired

  (26)  2,578.38 

Warrants outstanding and exercisable, December 31, 2024

  2,272,203   3.41 

Granted

  2,341,381   3.81 

Exercised

  (1,924,856)  3.67 

Warrants outstanding and exercisable, December 31, 2025

  2,688,728  $3.57 
Series F Preferred Warrants [Member]  
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Outstanding and Exercisable

 
  

Number of Warrants

  

Weighted Average Exercise Price

 

Warrants outstanding and exercisable, December 31, 2023

  32,750  $975 

Exercised

  (1,648) $975 

Warrants outstanding and exercisable, December 31, 2024

  31,102  $975 

Exercised

  (575) $975 

Warrants outstanding and exercisable, December 31, 2025

  30,527  $975