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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, All Other Investments [Abstract]  
Schedule of Cash and Marketable Securities by Significant Investment Category

The following tables show the Company’s cash, cash equivalents, restricted cash, and marketable securities by significant investment category as of June 30, 2023, and December 31, 2022:

 

   2023
       

Unrealized

Gain/

   Fair   Cash and Cash    Marketable 
   Cost    (Loss)   Value   Equivalents    Securities 
Cash  $9,971,000    $-   $9,971,000   $9,971,000    $     - 
Level 1                           
Money Market Funds  $62,000     -    62,000    62,000     - 
Marketable Securities   15,165,000     (3,590,000)   11,575,000    -     11,575,000 
Total  $25,198,000    $(3,590,000)  $21,608,000   $10,033,000    $11,575,000 

 

   2022 
       

Unrealized

Gain/

   Fair   Cash and Cash   

Marketable

     
   Cost    (Loss)   Value   Equivalents    Securities   Investments 
Cash  $19,226,000    $-   $19,226,000   $19,226,000    $-   $- 
Level 1                                
Money Market Funds   64,000     -    64,000    64,000     -    - 
Marketable Securities   36,263,000     (3,659,000)   27,307,000    -     27,307,000    - 
Level 2                                
Warrants   3,318,000     -    140,000    -     -    140,000 
Convertible securities   1,023,000     -    39,000    -     -    39,000 
Total  $59,894,000    $(3,659,000)  $46,776,000   $19,290,000    $27,307,000   $179,000