| 
 7.
Warrants 
  
The
following is a summary of activity in the number of warrants outstanding to purchase the Company’s common stock for the three months
ended March 31, 2024 (in thousands): 
 
 Schedule
of Warrants Activity 
  
    |   | 
  | 
    
 Warrants  Accounted for as: Equity 
 | 
  | 
  | 
    
 Warrants  Accounted for as:  Liabilities 
 | 
  | 
  | 
      | 
  | 
 
  
    |   | 
  | 
    May 2018   Warrants | 
  | 
  | 
    October 2013   Warrants | 
  | 
  | 
    January 2014   Warrants | 
  | 
  | 
    Total | 
  | 
 
  
    | Outstanding, December 31, 2023 | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
11 | 
  | 
  | 
      | 
11 | 
  | 
 
  
    | Exercised | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
 
  
    | Granted | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
 
  
    | Expired | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
(11 | 
) | 
  | 
      | 
(11 | 
) | 
 
  
    | Outstanding, March 31, 2024 | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
 
  
    | Expiration date: | 
  | 
      | 
- | 
  | 
  | 
      | 
- | 
  | 
  | 
      | 
1/16/2024 | 
  | 
  | 
      | 
1/16/2024 | 
  | 
 
   
  
 |