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Note 9 - Investments in Marketable Securities - Amortized Cost and Estimated Fair Value of Debt Securities as Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Within 1 year, cost | $ 20,602 | $ 19,664
Within 1 year, fair value | 20,058 | 19,328
1 to 5 years, cost | 71,239 | 81,517
1 to 5 years, fair value | 67,679 | 77,118
6 to 10 years, cost | 34,007 | 33,515
6 to 10 years, fair value | 31,582 | 30,802
Over 10 years, cost | 613 | 642
Over 10 years, fair value | 476 | 479
Cost | 126,461 | 135,338
Fair Value | $ 119,795 | $ 127,727

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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