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Accounts and Financing Receivables - Additional Information (Details) - Rental equipment | 3 Months Ended
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Sep. 30, 2017 USD ($)
Accounts Notes And Loans Receivable [Line Items] |
Interest rate | 5.00%
Term of sales-type lease | 3 years
Future minimum lease payments | $ 8,600,000
Future minimum lease payments, 2018 | 2,900,000
Future minimum lease payments, 2019 | 2,900,000
Future minimum lease payments, 2020 | 2,900,000
Residual value of equipment | $ 0

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- Definition Lessor sales type lease term of contract. + References No definition available. + Details
Name: | geos_LessorSalesTypeLeaseTermOfContract
Namespace Prefix: | geos_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Notes receivable interest rate. + References No definition available. + Details
Name: | geos_NotesReceivableInterestRate
Namespace Prefix: | geos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceived
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received next twelve months. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceivedNextTwelveMonths
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received three years. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceivedThreeYears
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease minimum lease payments to be received two years. + References No definition available. + Details
Name: | geos_SalesTypeLeaseMinimumLeasePaymentsToBeReceivedTwoYears
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales type lease residual value of leased asset. + References No definition available. + Details
Name: | geos_SalesTypeLeaseResidualValueOfLeasedAsset
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ProductOrServiceAxis=geos_ManufacturedRentalEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |