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