Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Oct. 31, 2022	Mar. 31, 2022
Cover [Abstract]
Entity Registrant Name	GEOSPACE TECHNOLOGIES CORP
Entity Central Index Key	0001001115
Document Type	10-K
Document Period End Date	Sep. 30, 2022
Amendment Flag	false
Document Fiscal Year Focus	2022
Title of 12(b) Security	Common Stock
Trading Symbol	GEOS
Security Exchange Name	NASDAQ
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Document Annual Report	true
Document Transition Report	false
Entity Public Float			$ 71
Entity Common Stock, Shares Outstanding		13,021,241
Entity Incorporation, State or Country Code	TX
Entity File Number	001-13601
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
Documents Incorporated by Reference	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