Vessels, net - Consolidated Statement of Comprehensive Income/ (loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disclosure of detailed information about property, plant and equipment [abstract]
Vessels' depreciation	$ 2,409	$ 2,398	$ 4,786	$ 4,788
Depreciation on office furniture and equipment	8	10	17	19
Depreciation of right of use asset	89	82	177	164
Total	$ 2,506	$ 2,490	$ 4,980	$ 4,971

The amount of depreciation of office furniture and equipment.

No definition available.

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