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Note 8 - Trade Accounts and Financing Receivables (Details Textual) - USD ($)		12 Months Ended
	Aug. 30, 2024	Sep. 30, 2025	Aug. 31, 2025	Sep. 30, 2024	Aug. 31, 2024
Financing Receivable, before Allowance for Credit Loss		$ 24,451,000		$ 12,996,000
Financing Receivable, Allowance for Credit Loss		914,000		$ 900,000
Promissory Note for Sale of Product [Member]
Financing Receivable, before Allowance for Credit Loss		$ 3,900,000	$ 3,600,000		$ 9,400,000
Notes Receivable, Interest Rate, Stated Percentage		8.75%	8.75%		9.50%
Notes Receivable, Periodic Payment		$ 100,000	$ 100,000		$ 900,000
Sales-type Lease, Interest Income		$ 600,000
Promissory Note [Member] | Discontinued Operations, Disposed of by Sale [Member] | Subsidiary, Oil and Gas Product Manufacturing Operations in the Russian Federation [Member]
Financing Receivable, before Allowance for Credit Loss	$ 3,500,000
Notes Receivable, Interest Rate, Stated Percentage	5.00%
Notes Receivable, Periodic Payment	$ 37,000
Notes Receivable, Term (Year)	10 years
Financing Receivable, Allowance for Credit Loss	$ 900,000

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- Definition

Percentage of interest rate on notes receivable.

+ References

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

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