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Note 8 - Prepaid Expenses and Other Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Equity Securities, FV-NI, Current | $ 9,476 | $ 11,705
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current | 1,410 | 1,981
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Noncurrent | $ 15,449 | 10,343
Debt Securities, Held-to-maturity, Term (Year) | 10 years |
Marketable Securities, Current | $ 16,961 | 8,538
Equity Securities, FV-NI, Noncurrent | 7,768 | $ 9,327
Other Income [Member] |  |
Equity Securities, FV-NI, Realized Gain (Loss), Total | (1,745) |
Letter of Credit [Member] | Asset Pledged as Collateral [Member] |  |
Short-Term Investments, Total | $ 6,014 |

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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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