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Note 8 - Prepaid Expenses and Other Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Equity Securities, FV-NI, Current | $ 3,945 | $ 9,476
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current | 389 | 1,410
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Noncurrent | $ 5,934 | 15,449
Debt Securities, Held-to-maturity, Term (Year) | 10 years |
Marketable Securities, Current | $ 19,188 | 16,961
Equity Securities, FV-NI, Noncurrent | 7,335 | $ 7,768
Other Income [Member] |  |
Equity Securities, FV-NI, Realized Gain (Loss) | 101 |
Letter of Credit [Member] | Asset Pledged as Collateral [Member] |  |
Short-Term Investments | $ 1,214 |

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- Definition Period between issuance and maturity of investment in debt security measured at amortized cost (held-to-maturity), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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