Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2023	Oct. 31, 2023	Mar. 31, 2023
Document Information [Line Items]
Entity Central Index Key	0001001115
Entity Registrant Name	GEOSPACE TECHNOLOGIES CORP
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2023
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 Filer Category	Non-accelerated Filer
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		13,197,489
Entity Public Float			$ 86,000,000
Auditor Firm ID	49
Auditor Name	RSM US LLP
Auditor Location	Houston, Texas, USA