v3.26.3
Note 5 - Stockholders' Equity - 10Q (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Notes Tables    
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Number

of Shares

   

Weighted-

Average

Exercise

Price

   

Weighted-

Average

Remaining

Contractual

Term (yrs)

   

Aggregate

Intrinsic

Value

 

Outstanding at December 31, 2025

    45,579     $ 137.20       8.6     $ -  

Granted

    266,200       1.18                  

Exercised

    -       -                  

Forfeited or expired

    (1,600 )     68.38                  

Outstanding at June 30, 2026

    310,179     $ 20.82       9.7     $ 23,958  

Exercisable at June 30, 2026

    22,130     $ 217.73       7.8     $ -  
   

Number

of Shares

   

Weighted-

Average

Exercise

Price

   

Weighted-

Average

Remaining

Contractual

Term (yrs)

   

Aggregate

Intrinsic

Value

 

Outstanding at December 31, 2024

    13,367     $ 317.75       8.6     $ 58,500  

Granted

    32,212       62.00                  

Exercised

    -       -                  

Forfeited or expired

    -       -                  

Outstanding at December 31, 2025

    45,579     $ 137.20       8.6     $ -  

Exercisable at December 31, 2025

    9,531     $ 423.93       7.2     $ -  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Risk-free interest rate

    4.34 %

Expected term (in years)

    7  

Expected volatility

 

200

%

Dividend yield

    0 %
   

2025

   

2024

 

Weighted average risk-free interest rates

    4.5 %     3.8 %

Expected dividend yield

    0.0 %     0.0 %

Expected life of option (in years)

    7.0       7.0  

Expected volatility

    179.3 %     204.2 %
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issue Date

 

Number

of Shares*

   

Exercise

Price

 

Expiration

September 2021

    268     $ 4,875.00  

September 2026

July 2025

    490,000       4.35  

July 2030

September 2025

    79,732       1.1877  

November 2030

December 2025

    223,899       1.1877  

December 2030

February 2026

    432,902       2.31  

June 2028

February 2026

    432,902       2.31  

June 2031

March 2026

    1,269,316       1.36  

June 2031

May 2026

    1,558,886       1.65  

June 2031

May 2026

    3,378,380       1.48  

May 2031

May 2026

    675,674       1.45  

November 2027

Outstanding at June 30, 2026

    8,541,959            

Issue Date

 

Number

of Shares*

   

Exercise

Price*

 

Expiration

September 2021

    268     $ 4,875.00  

September 2026

May 2024

    64,228       8.22  

May 2029

July 2024

    86,800       14.29  

January 2030

August 2024

    107,025       32.75  

March 2030

March 2025

    137,405       32.75  

June 2030

July 2025

    729,200       4.35  

July 2030

September 2025

    476,196       2.8543  

November 2030

December 2025

    2,273,763       2.8543  

December 2030

Outstanding at December 31, 2025

    3,874,885