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Note 6 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Aug. 31, 2025 | Aug. 01, 2025 | Aug. 30, 2024
Financing Receivable, before Allowance for Credit Loss | $ 24,451 | $ 12,996 |  |  |
Financing Receivable, Allowance for Credit Loss | 914 | 900 |  |  |
Impairment of Intangible Assets, Finite-Lived | 0 | 2,761 |  |  |
Geovox [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability | 2,540 | $ 0 | $ 2,500 | $ 2,500 |
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount |  |  | $ 3,300 | $ 3,300 |
Emerging Markets [Member] |  |  |  |  |
Impairment of Intangible Assets, Finite-Lived | $ 2,800 |  |  |  |
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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