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Note 7 - Rental Equipment - Rental Equipment (Details) - Equipment [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Rental equipment, primarily wireless recording equipment	$ 49,108	$ 63,111
Accumulated depreciation	(37,463)	(48,925)
Property, Plant, and Equipment, Lessor Asset under Lease, after Accumulated Depreciation	$ 11,645	$ 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: