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Investments in Securities and Fair Value (Schedule of Carrying Value and Fair Value of Financial Assets Disclosed) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 21,613	$ 24,031
Accrued interest and dividends	1,090	978
Equity securities, estimated fair value	36,708	37,212
Money market funds and U.S. Treasury bills	113,379	110,224
Investments, fair value disclosure, total	172,790	172,445
Level 1
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,613	24,031
Accrued interest and dividends	1,090	978
Equity securities, estimated fair value	36,708	37,212
Money market funds and U.S. Treasury bills	113,379	110,224
Investments, fair value disclosure, total	172,790	172,445
Level 2
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Accrued interest and dividends	0	0
Equity securities, estimated fair value	0	0
Money market funds and U.S. Treasury bills	0	0
Investments, fair value disclosure, total	0	0
Level 3
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Accrued interest and dividends	0	0
Equity securities, estimated fair value	0	0
Money market funds and U.S. Treasury bills	0	0
Investments, fair value disclosure, total	$ 0	$ 0

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Accrued dividends and interest, Estimated fair value

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
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-Topic 210
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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-Name Accounting Standards Codification
-Section S99
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