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Commitments - Future minimum lease revenues receivable under non-cancellable operating leases (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems [Line Items] |  |
Total | $ 8,323 | $ 3,078
Not later than one year [member] |  |
DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems [Line Items] |  |
Total | $ 8,323 | $ 3,078

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

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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_97&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |