Events after the reporting date (Details) - Convertible Note $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($) $ / shares shares
Disclosure of non-adjusting events after reporting period [Line Items]
Issuance of share capital due conversion of loan \| $	$ 428
Conversion price \| $ / shares	$ 2.25
Number of shares issued \| shares	190,403

The price per share of the conversion feature embedded in the debt instrument.

No definition available.

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Namespace Prefix:	glbs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in equity resulting from the conversion of convertible instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares issued by the entity.

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type: