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Note 5 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2026
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     $ -  
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 %
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