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Vessels, net (Details) - Vessels - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Vessels scrap rate | $ 300 |  | $ 250
Increase / (decrease) in depreciation expense due to changes in scrap rates |  | $ (88,000) |

X
- Definition The extra depreciation expense recognised during the period, due to changes in scrap rates. + References No definition available. + Details
Name: | glbs_ExtraDepreciationPropertyPlantAndEquipment
Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The estimated vessels' scrap rate per ton. + References No definition available. + Details
Name: | glbs_VesselsScrapRatePerTon
Namespace Prefix: | glbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ShipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |