Leases.

No definition available.

Name:	geos_LeasesLineItems
Namespace Prefix:	geos_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Lessor Operating Lease Commenced Date

+ References

No definition available.

+ Details

Name:	geos_LessorOperatingLeaseCommencedDate
Namespace Prefix:	geos_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Operating Rental Revenue Property Lease

+ References

No definition available.

+ Details

Name:	geos_NumberOfOperatingRentalRevenuePropertyLease
Namespace Prefix:	geos_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of operating right-of use asset related to leased facility.

+ References

No definition available.

+ Details

Name:	geos_NumberOfOperatingRightOfUseAssetRelatedToLeasedFacility
Namespace Prefix:	geos_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Trade accounts receivables included lease receivables.

+ References

No definition available.

+ Details

Name:	geos_TradeAccountsReceivablesIncludedLeaseReceivables
Namespace Prefix:	geos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

+ References

No definition available.

+ Details

Name:	us-gaap_EquipmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981

+ Details

Name:	us-gaap_LessorOperatingLeasePaymentsToBeReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

Name:	us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI https://asc.fasb.org/extlink&oid=126900988&loc=SL77927221-108306

+ Details

Name:	us-gaap_OperatingLeaseLeaseIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=geos_LeasedEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=geos_PropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=geos_CalgaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=geos_BogotaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
Leases - Additional Information (Details) $ in Thousands	Dec. 31, 2021	Sep. 30, 2022 USD ($) PropertyLeases OperatingRightOfUseAsset	Sep. 30, 2021 USD ($)
Leases [Line Items]
Rental revenue		$ 25,144	$ 19,000
Future minimum lease payments to be received		538
Rental equipment depreciation expense		$ 13,740	15,075
Number of operating rental revenue property lease \| PropertyLeases		2
Equipment
Leases [Line Items]
Trade accounts receivables included lease receivables		$ 3,200
Rental revenue		24,900	$ 19,000
Future minimum lease payments to be received		24,600
Property
Leases [Line Items]
Rental revenue		$ 200
Maximum \| Equipment
Leases [Line Items]
Lease term		1 year
Austin, Texas
Leases [Line Items]
Number of operating right-of use asset related to leased facility \| OperatingRightOfUseAsset		2
Calgary \| Property
Leases [Line Items]
Lease term	5 years
Lessor Operating Lease Commenced Date	2021-11
Bogota \| Property
Leases [Line Items]
Lease term	1 year
Lessor Operating Lease Commenced Date	2021-12