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v3.23.1

Note 16 - Risks and Uncertainties (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) $ / bbl
Revenue from Contract with Customer, Excluding Assessed Tax | $ 31,370 | $ 24,700 | $ 62,479 | $ 42,691 |
Oil and Gas, Average Sale Price (in USD per Barrel of Oil) | $ / bbl |  |  |  |  | 70
Geospace Technologies Eurasia LLC (GTE) [Member] |  |  |  |  |
Imported Product for Resale |  |  | 2,300 |  | $ 1,900
Equity, Attributable to Noncontrolling Interest | 6,000 |  | 6,000 |  |
Cash | $ 3,200 |  | 3,200 |  |
Geospace Technologies Eurasia LLC (GTE) [Member] | Geographic Distribution, Domestic [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  | 1,300 |  | $ 1,900
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |
Number of Major Customers | 3 |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] |  |  |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss | $ 8,500 |  | 8,500 |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member] |  |  |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss | 4,900 |  | 4,900 |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member] |  |  |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss | $ 3,400 |  | $ 3,400 |  |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |  |
Number of Major Customers | 3 |  | 3 |  |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer One [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 9,900 |  | $ 17,900 |  |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer Two [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,900 |  | 5,600 |  |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Customer Three [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,200 |  | $ 2,900 |  |

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