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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]    
Cost $ 32,738,000 $ 37,364,000
Unrealized Gain/(Loss) (15,797,000) (16,722,000)
Fair Value 16,941,000 20,642,000
Cash and Cash Equivalents 7,119,000 11,431,000
Current marketable securities 9,822,000 9,211,000
Investments
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 5,785,000 11,369,000
Unrealized Gain/(Loss)
Fair Value 5,785,000 11,369,000
Cash and Cash Equivalents 5,785,000 11,369,000
Current marketable securities
Investments
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  
Investments  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 1,234,000 62,000
Unrealized Gain/(Loss)
Fair Value 1,234,000 62,000
Cash and Cash Equivalents 1,234,000 62,000
Current marketable securities
Investments
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Cost 25,619,000 25,933,000
Unrealized Gain/(Loss) (15,797,000) (16,722,000)
Fair Value 9,822,000 9,211,000
Cash and Cash Equivalents
Current marketable securities 9,822,000 9,211,000
Investments