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Note 8 - Rental Equipment - Rental Equipment (Details) - Equipment [Member] - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Rental equipment, primarily wireless recording equipment | $ 48,571 | $ 63,111
Accumulated depreciation | (38,250) | (48,925)
Property, Plant, and Equipment, Lessor Asset under Lease, after Accumulated Depreciation | $ 10,321 | $ 14,186

X
- Definition Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under lease. + References No definition available. + Details
Name: | geos_PropertyPlantAndEquipmentLessorAssetUnderLeaseAccumulatedDepreciation
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under lease. + References No definition available. + Details
Name: | geos_PropertyPlantAndEquipmentLessorAssetUnderLeaseAfterAccumulatedDepreciation
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under lease. + References No definition available. + Details
Name: | geos_PropertyPlantAndEquipmentLessorAssetUnderLeaseBeforeAccumulatedDepreciation
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |