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Significant Accounting Policies - Additional Information (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Accounting Policies [Abstract] |
Cash and cash equivalents held by foreign subsidiaries and branch offices | $ 6.5

X
- Definition Cash and cash equivalents held by foreign subsidiaries. + References No definition available. + Details
Name: | geos_CashAndCashEquivalentsHeldByForeignSubsidiaries
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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