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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]    
Cost $ 37,300,000 $ 37,364,000
Unrealized Gain/(Loss) (18,051,000) (16,722,000)
Fair Value 19,249,000 20,642,000
Cash and Cash Equivalents 9,484,000 11,431,000
Current marketable securities 9,765,000 9,211,000
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 8,151,000 11,369,000
Unrealized Gain/(Loss)
Fair Value 8,151,000 11,369,000
Cash and Cash Equivalents 8,151,000 11,369,000
Current marketable securities
Restricted Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 100,000  
Unrealized Gain/(Loss)  
Fair Value 100,000  
Cash and Cash Equivalents 100,000  
Current marketable securities  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 1,233,000 62,000
Unrealized Gain/(Loss)
Fair Value 1,233,000 62,000
Cash and Cash Equivalents 1,233,000 62,000
Current marketable securities
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 27,816,000 25,933,000
Unrealized Gain/(Loss) (18,051,000) (16,722,000)
Fair Value 9,765,000 9,211,000
Cash and Cash Equivalents
Current marketable securities $ 9,765,000 $ 9,211,000