Commitments - Future minimum lease payments (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Total	$ 851	$ 1,044
Within one year
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Total	142	149
After one year but not more than five years
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Total	567	596
More than five years
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Total	$ 142	$ 299

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

No definition available.

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