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Cash and cash equivalents and Restricted Cash (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Cash and cash equivalents [abstract] |  |
Restricted cash and cash equivalents | $ 0 | $ 210
Fair value of restricted cash and cash equivalents | 0 | $ 210
Breached restricted cash collateral | $ 750 |

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- Definition The fair value of cash and cash equivalent items which are restricted as to withdrawal or usage. + References No definition available. + Details
Name: | glbs_RestrictedCashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of collateral requirements that should have been pledged in a restricted cash account, related with covenants that have been breached. + References No definition available. + Details
Name: | glbs_RestrictedCashCollateralBreached
Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RestrictedCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant