Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2024	Oct. 31, 2024	Mar. 31, 2024
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	2024
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2024
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	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		12,709,381
Entity Public Float			$ 164,000,000
Auditor Firm ID	49
Auditor Name	RSM US LLP
Auditor Location	Houston, Texas, USA