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

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

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+ Details