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Note 18 - Supplemental Cash Flow Information - Supplemental Cash Flow Information Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash paid for income taxes | $ 151 | $ 169
Non-cash investing and financing activities: |  |
Inventory transferred to rental equipment | 587 | 1,148
Inventory transferred to property, plant and equipment | 0 | 172
Issuance of notes receivables related to sale of used rental equipment | $ 0 | $ 11,745

X
- Definition Represents the amount of inventory transferred to rental equipment. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of inventory transferred to property, plant, and equipment. + References No definition available. + Details
Name: | geos_InventoryTransferredToPropertyPlantAndEquipment
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Issuance Of Notes Receivables In Connection With Sale Of Used Rental Equipment. + References No definition available. + Details
Name: | geos_IssuanceOfNotesReceivablesInConnectionWithSaleOfUsedRentalEquipment
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-2 + Details
Name: | us-gaap_IncomeTaxesPaidNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration