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Commitments - Future minimum contractual obligations (Details) $ in Thousands	Jun. 30, 2025 USD ($)
Olympia Shipholding S.A. [member]
IfrsStatementLineItems [Line Items]
July 1, 2025 to June 30, 2026	$ 3,760
July 1, 2026 to December 31, 2026	26,530
Total	30,290
Thalia Shipholding S.A. [member]
IfrsStatementLineItems [Line Items]
July 1, 2025 to June 30, 2026	3,760
July 1, 2026 to December 31, 2026	26,530
Total	30,290
Total [member]
IfrsStatementLineItems [Line Items]
July 1, 2025 to June 30, 2026	7,520
July 1, 2026 to December 31, 2026	53,060
Total	$ 60,580

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	glbs_ContractualObligations
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	glbs_ContractualObligationsDueInNextTwelveMonths
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	glbs_ContractualObligationsDueInSecondYear
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	glbs_IfrsStatementLineItems
Namespace Prefix:	glbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glbs_OlympiaShipholdingSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glbs_ThaliaShipholdingSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=glbs_TotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: