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Note 4 - Equity (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
      

Fair Value Measurement at September 30, 2025

 
  

Carrying Value

  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

                

Derivative liability

 $243,000        $243,000 

Totals liabilities measured and recorded at fair value

 $243,000  $  $  $243,000 
                 
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]
  

September 30, 2025

 

Closing stock price:

 $0.17 

Volatility:

  180.0%

Expected term (in years):

  1.70 

Risk-free rate:

  3.6%
    %
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

2025

  

2024

 
  Number of  Weighted Average  Number of  Weighted Average 
  

Warrants

  

Exercise Price

  

Warrants

  

Exercise Price

 

Outstanding at January 1,

  39,633  $503.75   3,052  $4,054.81 

Warrants issued

        64,124   118.37 

Outstanding at March 31,

  39,633  $503.75   67,176  $297.21 

Warrants exercised

        11,962   0.01 

Outstanding at June 30,

  39,633  $503.75   55,214  $361.60 

Warrants exercised

        15,580   0.01 

Warrants cancelled or expired

  25   7,620.00       

Outstanding at September 30,

  39,608  $499.26   39,634  $503.74 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Nine Months Ended September 30, 2024

Expected term (in years):

 

5.0

Risk-free rate:

 

4.52%

Volatility:

 

87.49%

Dividend yield:

 

0%

Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

2025

  

2024

 
  Number of  Weighted Average  Number of  Weighted Average 
  

Options

  

Exercise Price

  

Options

  

Exercise Price

 

Outstanding at January 1,

  5,706  $6,081.61   5,750  $6,054.32 

Options expired or cancelled

  1   4,280.00   9   1,620.00 

Outstanding at March 31,

  5,705  $6,081.93   5,741  $6,061.27 

Options expired or cancelled

        23   2,734.78 

Outstanding at June 30,

  5,705  $6,081.93   5,718  $6,074.65 

Options expired or cancelled

        9   2,766.67 

Outstanding at September 30,

  5,705  $6,081.93   5,709  $6,079.87 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

2025

  

2024

 
  

Number of

  

Weighted Average

  

Number of

  

Weighted Average

 
  

Units

  

Grant Date Fair Value

  

Units

  

Grant Date Fair Value

 

Outstanding at January 1,

  2,124  $362.71   1,049  $2,977.29 

Restricted stock units granted

  1,600   22.05       

Restricted stock units vested

  200   2,813.10   245   3,300.00 

Restricted stock units forfeited or cancelled

  37   2,861.35   127   3,300.00 

Outstanding at March 31,

  3,487  $39.34   677  $2,799.97 

Restricted stock units vested

  1,590   54.00   391   2,434.22 

Restricted stock units forfeited or cancelled

  297   54.00   81   3,300.00 

Outstanding at June 30,

  1,600  $22.05   205  $3,300.00 

Restricted stock units forfeited or cancelled

  240   22.05   1   3,300.00 

Outstanding at September 30,

  1,360  $22.05   204  $3,300.00