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Transactions with Related Parties (Details)	6 Months Ended
	Jun. 30, 2019 shares
Disclosure of transactions between related parties [Line Items]
Number of common shares held by the controlling party	1,252,258
Proportion of ownership interests held by the controlling party	29.00%

X

- Definition

The number of common shares held by the controlling party.

+ References

No definition available.

+ Details

Name:	glbs_NumberOfSharesHeldByControllingParty
Namespace Prefix:	glbs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The proportion of ownership interests held by the controlling party.

+ References

No definition available.

+ Details

Name:	glbs_ProportionOfOwnershipInterestsHeldByControllingParty
Namespace Prefix:	glbs_
Data Type:	num:percentItemType
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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration