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Note 11 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Jun. 30, 2022
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax | $ (0.2) | $ (0.5) |
Debt Security, Corporate, Non-US [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.75%
PEMEX [Member] |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 7.6 | $ 7.6 | $ 8.6

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