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Note 13 - Other Current Liabilities (Details Textual) $ in Millions | 12 Months Ended
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Sep. 30, 2024 USD ($)
Minimum Amount Per Claimant On Which Company Purchased Stop Loss | $ 0.2

X
- Definition Minimum amount per claimant on which company purchased stop loss. + References No definition available. + Details
Name: | geos_MinimumAmountPerClaimantOnWhichCompanyPurchasedStopLoss
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration