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Note 5 - Trade Accounts and Financing Receivables (Details Textual) - USD ($)		3 Months Ended	6 Months Ended
	Aug. 30, 2024	Mar. 31, 2025	Mar. 31, 2025	Sep. 30, 2024	Aug. 31, 2024
Financing Receivable, before Allowance for Credit Loss		$ 28,084,000	$ 28,084,000	$ 12,996,000
Financing Receivable, Allowance for Credit Loss		1,106,000	1,106,000	$ 900,000
Promissory Note for Sale of Product [Member]
Financing Receivable, before Allowance for Credit Loss					$ 9,400,000
Notes Receivable, Interest Rate, Stated Percentage					9.50%
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, Term (Year)	10 years
Notes Receivable, Periodic Payment	$ 37,000
Financing Receivable, Allowance for Credit Loss	$ 900,000
Wireless Seismic Equipment Customer [Member]
Sales-type Lease, Interest Income		$ 200,000	$ 300,000

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Percentage of interest rate on notes receivable.

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