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Note 7 - Prepaid Expenses and Other Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Equity Securities, FV-NI, Current | $ 11,994 | $ 3,945
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current | 14,166 | 389
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Noncurrent |  | 5,934
Marketable Securities, Current | 17,751 | 19,188
Equity Securities, FV-NI, Noncurrent | 6,768 | 7,335
Other Income [Member] |  |
Equity Securities, FV-NI, Realized Gain (Loss) | 540 | $ 101
Asset Pledged as Collateral [Member] | Letter of Credit [Member] |  |
Short-Term Investments | $ 15,192 |

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