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Note 9 - Share Based Payments (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Black-Scholes-Merton

 
                 
   

2022

   

2021

 
                 

Volatility

    68.7 %     134 %

Expected life of options (in years)

    5       5  

Risk-free interest rate

    4.27 %     0.80 %

Dividend yield

    0 %     0 %
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
                    Weighted          
                   

Average

         
   

Number

   

Weighted

   

Remaining

   

Aggregate

 
   

Of

   

Average

   

Contractual

   

Intrinsic

 
   

Shares

   

Exercise Price

   

Life (years)

   

Value*

 

Shares under option, January 1, 2021

    1,900,000     $ 0.21       -     $ -  

Options granted

    150,000     $ 0.46                  

Options exercised

    (450,000

)

  $ 0.10                  

Options cancelled and expired

    (150,000

)

  $ (0.51

)

               

Shares under option, December 31, 2021

    1,450,000     $ 0.24       5.33          

Options granted

    1,450,000     $ 0.62                  

Options exercised

    (410,000

)

  $ 0.10                  

Options cancelled and expired

    (150,000

)

  $ (0.40

)

               

Shares under option, December 31, 2022

    2,340,000     $ 0.49       6.44     $ 248  
Schedule of Nonvested Share Activity [Table Text Block]
           

Weighted

 
   

Number of

   

Average

 
   

Shares

   

Fair Value

 

Non-vested stock options at January 1, 2021

    83,334     $ 0.47  

Options granted

    150,000     $ 0.46  

Vested during period

    (83,834

)

  $ (0.47

)

Options cancelled

    -     $ -  

Non-vested shares under option, December 31, 2021

    150,000     $ 0.46  

Options granted

    1,450,000     $ 0.41  

Vested during period

    (50,000

)

  $ (0.59

)

Options cancelled

    -     $ -  

Non-vested shares under option, December 31, 2022

    1,550,000     $ 0.42  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
            Weighted                
           

Average

   

Weighted

         
           

Remaining

   

Average

   

Aggregate

 
           

Contractual

   

Exercise

   

Intrinsic

 
   

Options

   

Life (years)

   

Price

   

Value

 

Stock options exercisable

    790,000       8.08     $ 0.25     $ 248  

Stock options expected to vest

    1,550,000       9.77     $ 0.62     $ -  

Options exercisable and expected to vest

    2,340,000                          
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
            Weighted  
           

Average

 
   

Number of

   

Grant Date

 
   

Shares

   

Fair Value

 

Unvested January 1, 2021

    1,720,333     $ 0.89  

Granted restricted stock

    10,000     $ 0.85  

Cancelled restricted stock

    (49,000

)

  $ (0.65

)

Vested restricted stock

    (781,333

)

  $ (0.91

)

Unvested December 31, 2021

    900,000     $ 0.88  

Granted restricted stock

    505,000     $ 0.48  

Cancelled restricted stock

    (186,000

)

  $ (0.65

)

Vested restricted stock

    (618,333

)

  $ (0.89

)

Unvested December 31, 2022

    600,667     $ 0.62