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Note 7 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Stock by Class [Table Text Block]
              

Original

  

Shares

          

Shares

  

Conversion

  

Shares

 
  

Shares

  

Gross

  

Net

  

Conversion

  

Outstanding

  

Series F

  

Series F

  

Outstanding

  

Price at

  

Issuable at

 

Date of Purchase

 

Purchased

  

Proceeds

  

Proceeds

  

Price

  

December 31, 2025

  

Issued

  

Converted

  

March 31, 2026

  

March 31, 2026

  

March 31, 2026

 

November 15, 2023

  1,850  $1,850,000  $1,850,000  $124.7000   150         150  $0.8294   180,854 

March 6, 2024

  1,000   1,000,000   950,000   60.2900   100         100   0.8294   120,569 

May 31, 2024

  1,050   1,050,000   1,025,000   32.1500   135         135   0.8294   162,768 

July 18, 2025

  1,000   1,000,000   1,000,000   1.4000   422      (422)     0.8526

(i)

   

July 21, 2025

  500   500,000   500,000   1.4000   500      (500)     0.8526

(i)

   

July 24, 2025

  1,000   1,000,000   1,000,000   2.1900   1,000      (1,000)     0.8526

(i)

   

October 6, 2025

  1,000   1,000,000   1,000,000   2.3427   815      (640)  175   0.8526

(i)

  205,255 

November 24, 2025

  500   500,000   500,000   1.1347   500      (197)  303   0.8526

(i)

  355,384 

December 22, 2025

  500   500,000   500,000   0.9615   500         500   0.8526

(i)

  586,441 

January 2, 2026

  500   500,000   500,000   0.8526      500      500   0.8526   586,441 

Total March 31, 2026

  8,900  $8,900,000  $8,825,000  $   4,122   500   (2,759)  1,863  $   2,197,712 
                                         

(i) - Reflects the conversion price after the January 2026 Down Round Trigger that was triggered with the sale of Series F on January 2, 2026.

 
              

Original

  

Shares

          

Shares

  

Conversion

  

Shares

 
  

Shares

  

Gross

  

Net

  

Conversion

  

Outstanding

  

Series F

  

Series F

  

Outstanding

  

Price at

  

Issuable at

 

Date of Purchase

 

Purchased

  

Proceeds

  

Proceeds

  

Price

  

December 31, 2024

  

Issued

  

Converted

  

March 31, 2025

  

March 31, 2025

  

March 31, 2025

 

November 15, 2023

  1,850  $1,850,000  $1,850,000  $124.7000   150         150  $1.1000   136,364 

March 6, 2024

  1,000   1,000,000   950,000   60.2900   435      (335)  100   1.1000   90,909 

April 12, 2024

  1,050   1,050,000   1,050,000   37.0000   1,050      (1,050)     1.1000    

May 31, 2024

  1,050   1,050,000   1,025,000   32.1500   1,050      (525)  525   1.1000   477,273 

July 25, 2024

  500   500,000   500,000   23.1500   500      (500)     1.1000    

August 27, 2024

  500   500,000   500,000   20.1900   500         500   1.1000   454,545 

October 1, 2024 (i)

  1,500         12.0000   1,500         1,500   1.1000   1,363,636 

December 18, 2024

  750   750,000   750,000   5.2500   750         750   1.2036

(ii)

  623,131 

February 7, 2025

  1,000   1,000,000   1,000,000   2.2200      1,000      1,000   1.2036

(ii)

  830,841 

March 17, 2025

  500   500,000   500,000   1.2000      500      500   1.2036   415,420 

Total March 31, 2025

  9,700  $8,200,000  $8,125,000  $   5,935   1,500   (2,410)  5,025  $   4,392,119 
                                         

(ii) - Reflects the conversion price after the March 2025 Down Round Trigger that was triggered with the sale of Series F on March 17, 2025.

 
                                         
              

Original

  

Shares

          

Shares

  

Conversion

  

Shares

 
  

Shares

  

Gross

  

Net

  

Conversion

  

Outstanding

  

Series G

  

Series G

  

Outstanding

  

Price at

  

Issuable at

 

Date of Purchase

 

Purchased

  

Proceeds

  

Proceeds

  

Price

  

December 31, 2025

  

Issued

  

Converted

  

March 31, 2026

  

March 31, 2026

  

March 31, 2026

 

November 10, 2025

  12,000  $12,000,000  $  $1.2300   6,190      (6,190)    $0.9615    

March 4, 2026

  250   250,000      1.0000      250   (250)     1.0000    

March 5, 2026

  2,000   2,000,000      1.0000      2,000   (1,500)  500   1.0000   500,000 

Total March 31, 2026

  14,250  $14,250,000  $  $   6,190   2,250   (7,940)  500  $   500,000 
                                         
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

March 31, 2026

  

December 31, 2025

 

Exercise price

 $  $ 

Stock price

 $0.9040  $0.8138 

Expected term (years)

  3.50   3.75 

Volatility

  146.65%  140.18%

Risk-free rate

  3.81%  3.64%

Dividend yield

  0.00%  0.00%

Probability of capital raise below exercise price

  100.00%  100.00%
Schedule of Dividends Payable [Table Text Block]

Deemed Dividend on Series F and G Preferred Stock

 
  

Description of

 

Series F and G Shares

  

Conversion Price

  

Conversion Price

  

Incremental Value

 

Date of Trigger Event

 

Trigger Event

 

Triggered

  

Prior to Trigger

  

After Trigger

  

Deemed Dividend

 

January 2, 2026

 

January 2026 Down Round Trigger

  10,324,493  $0.9615  $0.8526  $1,291,691 
  

Deemed Dividends on Series F and G Preferred Stock

             $1,291,691 
                   

Deemed Dividend on Series F Warrants

 

January 2, 2026

 

January 2026 Down Round Trigger

  4,752,651  $0.9615  $0.8526   57,792 
  

Deemed Dividends on Series F Warrants

             $57,792 
                   
  

Total Deemed Dividends Series F and G Preferred Stock and Series F Warrants

             $1,349,483 
                   
                   

Deemed Dividends on Series F Preferred Stock

 
 

Description of

 

Series F

  

Conversion Prices

  

Conversion Price

  

Incremental Value

 

Date of Trigger Event

Trigger Event

 

Triggered

  

Prior to Trigger

  

After Trigger

  

Deemed Dividend

 

March 17, 2025

March 2025 Down Round Trigger

  5,025  $2.22 - 5.25  $1.2000  $976,637 
 

Deemed Dividends on Series F Preferred Stock

             $976,637 
                  

Deemed Dividends on Series F Warrants

 

March 17, 2025

March 2025 Down Round Trigger

  593,247  $2.22 - 5.25  $1.2000   79,695 
 

Deemed Dividends on Series F Warrants

             $79,695 
                  
 

Total Deemed Dividends Series F PS and Series F Warrants

             $1,056,332 
                  

Series F and Series F Warrants issued prior to December 2024 have conversion and exercise prices equal to $1.10 and were not impacted by the March 2025 Down Round Trigger.

 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
      

Weighted Average

 
      

Grant Date

 
  

Shares

  

Fair Value

 

Outstanding as of December 31, 2025

  52,040  $34.26 

Granted

  858,997   0.95 

Cancelled

      

Vested and released

  (25,000)  1.06 

Outstanding as of March 31, 2026

  886,037   2.90 

Vested as of March 31, 2026

  12,437   137.44 

Unvested as of March 31, 2026

  873,600  $0.98 
      

Weighted Average

 
      

Grant Date

 
  

Shares

  

Fair Value

 

Outstanding as of December 31, 2024

  7,293  $324.64 

Granted

  72,194   2.10 

Cancelled

  (1,072)  264.60 

Vested and released

      

Outstanding as of March 31, 2025

  78,415   28.57 

Vested as of March 31, 2025

  8,015   255.33 

Unvested as of March 31, 2025

  70,400  $2.75 
Equity-Linked Instruments [Member]  
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

For the Three Months Ended

  

March 31,

  

2026

 

2025

Expected term (years)

 

0.50 - 2.75

 

2.00 - 3.00

Volatility

 

144.52 - 158.40%

 

140.71 - 161.65%

Risk-free rate

 

3.51 - 3.58%

 

4.03 - 4.06%

Dividend yield

 

0.00%

 

0.00%