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v3.25.3

Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment, Estimated Useful Life (Details) | Sep. 30, 2025
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Rental Equipment [Member] | Minimum [Member] |
Property, plant and equipment, useful lives (Year) | 2 years
Rental Equipment [Member] | Maximum [Member] |
Property, plant and equipment, useful lives (Year) | 5 years
Machinery and Equipment [Member] | Minimum [Member] |
Property, plant and equipment, useful lives (Year) | 3 years
Machinery and Equipment [Member] | Maximum [Member] |
Property, plant and equipment, useful lives (Year) | 15 years
Building and Building Improvements [Member] | Minimum [Member] |
Property, plant and equipment, useful lives (Year) | 10 years
Building and Building Improvements [Member] | Maximum [Member] |
Property, plant and equipment, useful lives (Year) | 50 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member] |
Property, plant and equipment, useful lives (Year) | 5 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member] |
Property, plant and equipment, useful lives (Year) | 10 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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