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Events after the reporting date (Details) - February 2017 Private Placement - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 09, 2018 | Dec. 31, 2017 | Feb. 08, 2017
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Number of warrants exercised | 375,000 | 1,481,808 |
Proceeds from warrant exercises | $ 600 | $ 2,371 |
Number of shares called by warrants | 30,523,209 | 30,898,209 | 25,000,000

X
- Definition Number of shares into which the warrants may be converted. + References No definition available. + Details
Name: | glbs_NumberOfSharesCalledByWarrants
Namespace Prefix: | glbs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of warrants exercised. + References No definition available. + Details
Name: | glbs_NumberOfWarrantsExercised
Namespace Prefix: | glbs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
Name: | glbs_ProceedsFromWarrantExercises
Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
Name: | ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=glbs_February2017PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |