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Note 5 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2024 | Aug. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Financing Receivable, before Allowance for Credit Loss | $ 12,996 |  | $ 1,216
Financing Receivable, Allowance for Credit Loss | $ 900 |  | $ (0)
Promissory Note [Member] | Subsidiary, Oil and Gas Product Manufacturing Operations in the Russian Federation [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 3,500 |
Financing Receivable, Allowance for Credit Loss |  | 900 |
Promissory Note [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Subsidiary, Oil and Gas Product Manufacturing Operations in the Russian Federation [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 3,500 |
Financing Receivable, Allowance for Credit Loss |  | $ 900 |

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