Consolidated Statements of Changes in Shareholders’ (Deficit) Equity (Parentheticals)	12 Months Ended
Dec. 31, 2022 shares
Statement of Stockholders' Equity [Abstract]
Sale of Private Placement Warrants	8,537,500

Represents the Share of sale of private placement warrants.

No definition available.

Name:	gbbk_SaleOfPrivatePlacementWarrants
Namespace Prefix:	gbbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration