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Note 3 - Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Outstanding Options

 
  

Number of Shares

  

Weighted Average Exercise

Price (Per Share)

 

Balance at January 1, 2024

  11,407,772  $0.26 

Options granted

  2,200,000   0.24 

Options forfeited/expired

  (41,250)  0.41 

Balance at March 31, 2024

  13,566,522  $0.25 

Exercisable, March 31, 2024

  4,459,388  $0.30 

Vested and expected to vest

  11,519,254  $0.26 
  

Outstanding Options

  

Number of Shares

  

Weighted Average Exercise Price

Balance at January 1, 2023

 

3,369,322

 

$

0.41

Options granted 

 

3,506,500

  

0.26

Options forfeited/expired 

 

 (108,542)

  

0.30

Balance at March 31, 2023

 

6,767,280

 

$

0.33

Exercisable, March 31, 2023

 

3,447,666

 

$

0.34

Vested and expected to vest 

 

5,862,975

 

$

0.33

Nonvested Restricted Stock Shares Activity [Table Text Block]
  

Restricted Shares

  

Weighted-Average

Grant Date Fair

Value per share

  

Weighted-Average

Contractual Life

(years)

 

Non-vested restricted stock at January 1, 2024

  600,000  $0.26   - 

Granted

  -   -     

Vested

  -   -     

Cancelled/expired

  -   -     

Non-vested restricted stock at March 31, 2024

  600,000  $0.26   9.1 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Three months ended March 31,

 
  

2024

  

2023

 
         

Stock options

 $150  $213 

Common stock award

  -   17 

Restricted stock

  8   36 
  $158  $266 
         

Income statement account:

        

Selling and marketing

 $20  $22 

General and administrative

  138   244 
  $158  $266 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Three months ended March 31,

 
  

2024

  

2023

 

Expected dividend yield

      

Expected stock price volatility

  89.3%  88.4%

Risk-free interest rate

  4.2%  4.0%

Expected term (in years)

  5.9   5.5 

Weighted-average grant date fair-value

 $0.18  $0.19 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Number

Outstanding

  

Remaining

Contractual Life

(Years)

  

Exercise Price Per

Share

  

Number

Exercisable

 

Jones Special Warrants (1)

  6,022,102   0.13  $0.63

USD

  6,022,102 

Pinestar Warrants (2)

  -   -   0.06

CAD

  - 
   6,022,102           6,022,102