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Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2022 | Jun. 30, 2022
Foreign Exchange Contract [Member] |  |  |  |  |
Derivative, Fair Value, Net |  | $ 0 | $ 2,621 |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative, Fair Value, Net |  |  | $ 2,600 |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.75% |
PEMEX [Member] |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current |  |  |  |  | $ 8,600
Debt Securities, Available-for-Sale, Term (Year) |  |  |  |  | 7 years
Debt Securities, Available-for-Sale, Sold at Par Value | $ 600 | $ 8,000 |  |  |

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