Description of the frequency of periodic payments (monthly, quarterly, annual).

No definition available.

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

- Definition

The number of periodic payments.

+ References

No definition available.

+ Details

Name:	glbs_BorrowingsNumberOfPeriodicPayments
Namespace Prefix:	glbs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

No definition available.

+ Details

Name:	glbs_BorrowingsPeriodicPayment
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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

- Definition

The amount of a specific compensating balance arrangement that is maintained per vessel, under an agreement for a bank loan.

+ References

No definition available.

+ Details

Name:	glbs_CompensatingBalanceAmountPerVessel
Namespace Prefix:	glbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The ratio of the aggregate fair market value of the mortgaged vessels to the loan outstanding balance.

+ References

No definition available.

+ Details

Name:	glbs_FairValueOfMortgagedVesselsToLoanOutstandingBalanceRatio
Namespace Prefix:	glbs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

+ Details

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

- 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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from borrowings obtained. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 17
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to settle borrowings, classified as financing activities. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 17
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17_d&doctype=Standard
-URIDate 2018-03-16

+ Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=glbs_DVBBankLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	glbs_CreditFacilityAxis=glbs_TrancheAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	glbs_CreditFacilityAxis=glbs_TrancheBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	glbs_CreditFacilityAxis=glbs_TrancheAAndTrancheBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=glbs_MacquarieBankInternationalLimitedLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	glbs_CreditFacilityAxis=glbs_ArtfulAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	glbs_CreditFacilityAxis=glbs_LongevityAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt, Net - DVB Loan Agreement and Macquarie Loan Agreement (Details) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2011 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items]
Proceeds from borrowings			$ 15,700	$ 280	$ 5,950
Repayments of debt			19,497	$ 4,399	$ 3,100
DVB Bank SE
Disclosure of detailed information about borrowings [line items]
Loan Facility, Maximum borrowing capacity	$ 40,000
DVB Bank SE \| Tranche A
Disclosure of detailed information about borrowings [line items]
Proceeds from borrowings	$ 19,000
DVB Bank SE \| Tranche B
Disclosure of detailed information about borrowings [line items]
Proceeds from borrowings		$ 18,000
DVB Bank SE \| Tranche A and Tranche B
Disclosure of detailed information about borrowings [line items]
Repayments of debt			15,010
Macquarie Bank International Limited
Disclosure of detailed information about borrowings [line items]
Loan Facility, Maximum borrowing capacity			13,500
Macquarie Bank International Limited \| Artful Advance
Disclosure of detailed information about borrowings [line items]
Proceeds from borrowings			$ 6,000
Borrowings Number Of Periodic Payments			20
Borrowings Frequency Of Periodic Payment			quarterly
Periodic payment			$ 222
Balloon Payment to be Paid			$ 1,560
Borrowings, maturity			December 2023
Macquarie Bank International Limited \| Longevity Advance
Disclosure of detailed information about borrowings [line items]
Proceeds from borrowings			$ 7,500
Borrowings Number Of Periodic Payments			20
Borrowings Frequency Of Periodic Payment			quarterly
Periodic payment			$ 221
Balloon Payment to be Paid			$ 3,080
Borrowings, maturity			December 2023
Macquarie Bank International Limited \| Minimum
Disclosure of detailed information about borrowings [line items]
Fair value of mortgaged vessels to loan outstanding balance ratio			160.00%
Compensating Balance, Amount per vessel			$ 375