| Document And Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Sep. 30, 2022 | Oct. 31, 2022 | Mar. 31, 2022 | |
| Document Information [Line Items] | |||
| Entity, Registrant Name | GEOSPACE TECHNOLOGIES CORPORATION | ||
| Current Fiscal Year End Date | --09-30 | ||
| Document, Fiscal Period Focus | FY | ||
| Document, Fiscal Year Focus | 2022 | ||
| Document, Type | 10-K/A | ||
| Document, Annual Report | true | ||
| Document, Period End Date | Sep. 30, 2022 | ||
| Document, Transition Report | false | ||
| Entity, File Number | 001-13601 | ||
| Entity, Incorporation, State or Country Code | TX | ||
| Entity, Tax Identification Number | 76-0447780 | ||
| Entity, Address, Address Line One | 7007 Pinemont Drive | ||
| Entity, Address, City or Town | Houston | ||
| Entity, Address, State or Province | TX | ||
| Entity, Address, Postal Zip Code | 77040-6601 | ||
| City Area Code | 713 | ||
| Local Phone Number | 986-4444 | ||
| Title of 12(b) Security | Common Stock | ||
| Trading Symbol | GEOS | ||
| Security Exchange Name | NASDAQ | ||
| Entity, Well-known Seasoned Issuer | No | ||
| Entity, Voluntary Filers | No | ||
| Entity, Current Reporting Status | Yes | ||
| Entity, Interactive Data, Current | Yes | ||
| Entity, Small Business | true | ||
| Entity, Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | false | ||
| Document, Financial Statement Error Correction Flag | false | ||
| Entity, Shell Company | false | ||
| Entity, Common Stock Shares, Outstanding | 13,021,241 | ||
| Entity, Public Float | $ 71 | ||
| Documents Incorporated By Reference Text Block | Portions of the definitive proxy statement for the Registrant’s 2023 Annual Meeting of Stockholders are incorporated by reference into Part III of this report. | ||
| Auditor Firm ID | 49 | ||
| Auditor Name | RSM US LLP | ||
| Auditor Location | Houston, Texas, USA | ||
| Amendment Description | This Amendment No. 1 on Form 10-K/A (this "Amendment") to amend the Annual Report on Form 10-K of Geospace Technologies Corporation (the "Company") for the fiscal year ended September 30, 2022 originally filed with the Securities and Exchange Commission on November 18, 2022 (the "Original 10-K") is being filed solely to correct an administrative error in the content of the Reports of Independent Registered Public Accounting Firm to the Form 10-K that resulted in the omission of the signature of the Company’s auditors. Reports of Independent Registered Public Accounting Firm with the appropriate signatures have been included in this Amendment. This Amendment speaks as of the original filing date and does not reflect events occurring after the filing of the Original 10-K. No revisions are being made to the Company’s financial statements or any other disclosure contained in the Original 10-K As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, the certifications by our principal executive officer and principal financial officer, filed as Exhibits 31.1 and 31.2, respectively, have been revised, re-executed and re-filed as of the date of this Amendment No. 1 to the Annual Report on Form 10-K. Since no financial statements have been included in this Amendment, certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 have been omitted. | ||
| Amendment Flag | true | ||
| Entity, Central Index Key | 0001001115 |
