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Significant Accounting Policies (Policies) | 9 Months Ended
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Jun. 30, 2025
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation The consolidated balance sheet of Geospace Technologies Corporation and its subsidiaries (the “Company”) at September 30, 2024, was derived from the Company’s audited consolidated financial statements at that date. The consolidated balance sheet at June 30, 2025 and the consolidated statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the three and nine months ended June 30, 2025 and 2024 were prepared by the Company without audit. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position, results of operations and cash flows were made. All significant intercompany balances and transactions have been eliminated. The results of operations for the three and nine months ended June 30, 2025, are not necessarily indicative of the operating results for a full year or of future operations. Certain information and footnote disclosures normally included in financial statements presented in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") were omitted pursuant to the rules of the Securities and Exchange Commission. The accompanying consolidated financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the Company’s fiscal year ended September 30, 2024.
Use of Estimates, Policy [Policy Text Block] | Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company considers many factors in selecting appropriate operational and financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these financial statements. The Company continually evaluates its estimates, including those related to revenue recognition, credit loss, collectability of rental revenue, inventory obsolescence reserves, self-insurance reserves, product warranty reserves, useful lives of long-lived assets, impairment of long-lived assets, impairment of goodwill and other intangible assets and deferred income tax assets. The Company bases its estimates on historical experience and various other factors that are believed to be reasonable under the circumstances. While management believes current estimates are reasonable and appropriate, actual results may differ from these estimates under different conditions or assumptions.
Cash and Cash Equivalents, Policy [Policy Text Block] | Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original or remaining maturity at the time of purchase of three months or less to be cash equivalents. At June 30, 2025 and September 30, 2024, cash and cash equivalents included $1.0 million and $1.1 million, respectively, held by the Company’s foreign subsidiaries and branch offices.
Concentration Risk, Credit Risk, Policy [Policy Text Block] | Concentration of Credit Risk The Company sells products to customers throughout the United States and various foreign countries. The Company’s normal credit terms for trade receivables are 30 days. In certain situations, credit terms may be extended to 60 days or longer. The Company performs ongoing credit evaluations of its customers and generally does not require collateral for its trade receivables. Additionally, the Company provides long-term financing in the form of promissory notes and sales-type leases when competitive conditions require such financing. In such cases, the Company may require collateral. Allowances are recognized immediately for expected credit losses. The Company determines the allowance for credit losses through a review of several factors, including historical collection experience, customer credit worthiness, current aging of customer accounts and financial conditions of its customers. Receivables are charged off against the allowance whenever it is probable that the balance will not be recoverable. The Company had trade accounts and financing receivables from two customers of $15.3 million and $9.7 million, respectively at June 30, 2025. These receivables are related to the Company's Energy Solutions segment. The Company recognized revenue from these customers of $1.1 million and zero, respectively, for the three months ended June 30, 2025, and $20.6 million and $75,000, respectively, for the nine months ended June 30, 2025. The Company recognized revenue from these customers of $1.3 million and $3.4 million, respectively, for the three months ended June 30, 2024, and $35.0 million and $10.1 million, respectively, for the nine months ended June 30, 2024, respectively.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] | Impairment of Long-lived Assets The Company's long-lived assets are reviewed for impairment whenever an event or circumstance indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review, if necessary, includes a comparison of the expected future cash flows (undiscounted and without interest charges) to be generated by an asset group with the associated carrying value of the related assets. If the carrying value of the asset group exceeds the expected future cash flows, an impairment loss is recognized to the extent that the carrying value of the asset group exceeds its fair value. During the quarter ended June 30, 2025, no events or changes in circumstances were identified indicating the carrying value of any of the Company's asset groups may not be recoverable.
Research and Development Expense, Policy [Policy Text Block] | Research and Development We incur significant future research and development expenditures. These efforts are primarily aimed at the development of additional products for each of our business segments. The majority of our product research and development costs relates to the Company's engineers. The Company's engineering staff have been key to our past success. Research and development expense includes personnel costs of the Company's engineers, project expenditures, on-going product maintenance and improvements to our existing products, as well as general and administrative expenses associated with the engineering department. Research and development expense for the three and nine months ended June 30, 2025 was $4.2 million and $14.4 million, respectively. Research and development expense for the three and nine months ended June 30, 2024 was $4.0 million and $11.5 million, respectively.
New Accounting Pronouncements, Policy [Policy Text Block] | Recently Issued Accounting Pronouncements In November 2024, the Financial Accounting Standards Board ("FASB"), as further amended in January 2025, issued guidance requiring enhanced disclosures in financial statements by requiring detailed disclosures of specific expenses like inventory purchases, employee compensation, depreciation, and intangible asset amortization. The guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the provisions of this guidance and the impact on its consolidation financial statements. In November 2023, the FASB issued guidance which updates reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The guidance is effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The guidance shall be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the provisions of this guidance and the impact on its consolidated financial statements. In December 2023, the FASB issued guidance improvements on income tax disclosure which will require the Company to disclose specified additional information in its income tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. The guidance will also require the Company to disaggregate its income taxes paid disclosure by federal, state and foreign taxes, with further disaggregation required for significant individual jurisdictions. The Company will adopt this guidance in its fourth quarter of fiscal year 2026. The guidance allows for adoption using either a prospective or retrospective transition method. The adoption of this guidance is not expected to have any material impact on its consolidation financial statements. All other new accounting pronouncements that have been issued, but not yet effective, are currently being evaluated and at this time are not expected to have a material impact on the Company's financial position or results of operations.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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- Definition Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-1 + Details
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- Definition Disclosure of accounting policy for credit risk. Includes, but is not limited to, policy for entering into master netting arrangement or similar agreement to mitigate credit risk of financial instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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- Definition Disclosure of accounting policy for recognizing and measuring the impairment of long-lived assets. An entity also may disclose its accounting policy for long-lived assets to be sold. This policy excludes goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480091/360-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 05 -Paragraph 4 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482338/360-10-05-4 + Details
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- Definition Disclosure of accounting policy for costs it has incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 730 -SubTopic 10 -Name Accounting Standards Codification -Section 05 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483044/730-10-05-1 + Details
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