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Note 14 - Risks and Uncertainties (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax	$ 25,858	$ 32,715	$ 100,160	$ 95,194
Geospace Technologies Eurasia LLC (GTE) [Member]
Imported Product for Resale			2,500		$ 3,800
Equity, Attributable to Noncontrolling Interest	6,000		6,000
Cash	$ 2,000		2,000
Geospace Technologies Eurasia LLC (GTE) [Member] | Geographic Distribution, Domestic [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 2,600		$ 1,800
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	1	1	1	1
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,300	$ 1,500	$ 35,000	$ 4,400
Accounts and Financing Receivable, after Allowance for Credit Loss	$ 4,500		$ 4,500

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