Commitments and Contingencies (Detail)	Dec. 31, 2020 USD ($)
Commitments and Contingencies
Provision for financial receivable unfunded credit losses	$ 32,881

Aggregate amount of credit losses from transactions related to unfunded commitments for financial instruments

No definition available.

Name:	glbz_ProvisionForFinancialReceivableUnfundedCreditLosses
Namespace Prefix:	glbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant