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Basis of Preparation And Significant Accounting Policies (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018
Basis of Preparation and Significant Accounting Policies [line items] |  |
Working capital deficit |  | $ (43,323)
Increase/ decrease in voyage revenues | $ 233 |
Increase/ decrease in voyage expenses | $ 233 |

X
- Definition The increase (decrease) during the reporting period in expenses arising from rendering of services. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in revenues arising from rendering of services. + References No definition available. + Details
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Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of current assets less the amount of current liabilities. + 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
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Data Type: | xbrli:monetaryItemType
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X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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