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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Cash and Cash Equivalents [Line Items]    
Cost $ 37,703,000 $ 33,919,000
Unrealized Gain/(Loss) (17,426,000) (17,325,000)
Fair Value 20,277,000 16,594,000
Cash and Cash Equivalents 10,719,000 6,615,000
Current marketable securities 9,558,000 9,979,000
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 10,649,000 6,545,000
Unrealized Gain/(Loss)
Fair Value 10,649,000 6,545,000
Cash and Cash Equivalents 10,649,000 6,545,000
Current marketable securities
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 70,000 70,000
Unrealized Gain/(Loss)
Fair Value 70,000 70,000
Cash and Cash Equivalents 70,000 70,000
Current marketable securities
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 26,984,000 27,304,000
Unrealized Gain/(Loss) (17,426,000) (17,325,000)
Fair Value 9,558,000 9,979,000
Cash and Cash Equivalents
Current marketable securities $ 9,558,000 $ 9,979,000