Note 16 - Risks and Uncertainties (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / item	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax	$ 32,715	$ 20,691	$ 95,194	$ 63,382
Oil and Gas, Average Sale Price (in USD per Per Share) | $ / item			65
Geospace Technologies Eurasia LLC (GTE) [Member]
Imported Product for Resale			$ 3,200		$ 1,900
Equity, Attributable to Noncontrolling Interest	6,200		6,200
Cash	$ 2,100		2,100
Geospace Technologies Eurasia LLC (GTE) [Member] | Geographic Distribution, Domestic [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			1,600		$ 1,900
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	$ 5,900		5,900
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	$ 4,700		$ 4,700
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Number of Major Customers	2		2
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer One [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 8,000		$ 25,900
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer Two [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,700		$ 9,300