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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Cash and Cash Equivalents [Line Items]    
Adjusted Cost $ 26,000,000 $ 59,894,000
Unrealized Gain/(Loss) (8,039,000) (3,659,000)
Fair Value 17,961,000 46,776,000
Cash and Cash Equivalents 6,897,000 19,290,000
Current marketable securities 11,064,000 27,307,000
Investments   179,000
Fair Value, Inputs, Level 2 [Member] | Convertible Securities [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost   1,023,000
Unrealized Gain/(Loss)  
Fair Value   39,000
Cash and Cash Equivalents  
Current marketable securities  
Investments   39,000
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost   3,318,000
Unrealized Gain/(Loss)  
Fair Value   140,000
Cash and Cash Equivalents  
Current marketable securities  
Investments   140,000
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 6,827,000 19,226,000
Unrealized Gain/(Loss)
Fair Value 6,827,000 19,226,000
Cash and Cash Equivalents 6,827,000 19,226,000
Current marketable securities
Investments  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 70,000 64,000
Unrealized Gain/(Loss)
Fair Value 70,000 64,000
Cash and Cash Equivalents 70,000 64,000
Current marketable securities
Investments  
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 19,103,000 36,263,000
Unrealized Gain/(Loss) (8,039,000) (3,659,000)
Fair Value 11,064,000 27,307,000
Cash and Cash Equivalents
Current marketable securities $ 11,064,000 27,307,000
Investments