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Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Cash and Cash Equivalents [Line Items] |  |
Cost | $ 34,881,000 | $ 33,919,000
Unrealized Gain/(Loss) | (17,146,000) | (17,325,000)
Fair Value | 17,735,000 | 16,594,000
Cash and Cash Equivalents | 9,252,000 | 6,615,000
Current marketable securities | 8,483,000 | 9,979,000
Cash [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cost | 9,182,000 | 6,545,000
Unrealized Gain/(Loss) |  |
Fair Value | 9,182,000 | 6,545,000
Cash and Cash Equivalents | 9,182,000 | 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 | 26,629,000 | 27,304,000
Unrealized Gain/(Loss) | (17,146,000) | (17,325,000)
Fair Value | 8,483,000 | 9,979,000
Cash and Cash Equivalents |  |
Current marketable securities | $ 8,483,000 | $ 9,979,000

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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