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Note 4 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Aug. 30, 2024
Emerging Markets [Member] |  |
Impairment of Intangible Assets, Finite-Lived | $ 2.8 |
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 |  | $ 3.5
Financing Receivable, Allowance for Credit Loss |  | 0.9
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 |  | 3.5
Financing Receivable, Allowance for Credit Loss |  | $ 0.9

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