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NET CAPITAL REQUIREMENTS (Details)	Mar. 31, 2026 item
NET CAPITAL REQUIREMENTS
Number of registered broker dealers	4

X

- Definition

The number of registered broker dealers in operation.

+ References

No definition available.

+ Details

Name:	bcg_NumberOfRegisteredBrokerDealers
Namespace Prefix:	bcg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_BankingAndThriftOtherDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration