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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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