Note 14 - Risks and Uncertainties (Details Textual) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2023 USD ($)	Jun. 30, 2023	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / item
Revenue from Contract with Customer, Excluding Assessed Tax	$ 50,032		$ 31,109
AverageSalesPrice (in USD per Per Share) | $ / item				70
Geospace Technologies Eurasia LLC (GTE) [Member]
Imported Product for Resale	500			$ 3,800
Equity, Attributable to Noncontrolling Interest	5,700
Cash	1,800
Geospace Technologies Eurasia LLC (GTE) [Member] | Geographic Distribution, Domestic [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 300			$ 1,800
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	$ 33,600
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] | Letter of Credit [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	28,700
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Accounts and Financing Receivable, after Allowance for Credit Loss	2,400
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	31,400		$ 1,700
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer Two [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,500		$ 2,700