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Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Proceeds from Sale of Debt Securities, Available-for-Sale |  | $ 2,208 | $ 0 |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax | $ 100 | 300 |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.75%
PEMEX [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 6,400 | 6,400 |  | $ 8,600
Debt Securities, Available-for-Sale, Sold at Par Value |  | 2,200 |  |
Proceeds from Sale of Debt Securities, Available-for-Sale |  | $ 2,200 |  |

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