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Revenue - Trade Sale Revenue (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Trade sales receivable	$ 956,999	$ 1,691,295
Trade sales payable	892,543	2,180,783
Trade sales revenue	$ 4,980,829	$ 8,710,014

X

- Definition

Trade sales payable.

+ References

No definition available.

+ Details

Name:	bbgi_TradeSalesPayable
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Trade sales receivable.

+ References

No definition available.

+ Details

Name:	bbgi_TradeSalesReceivable
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Trade sales revenue.

+ References

No definition available.

+ Details

Name:	bbgi_TradeSalesRevenue
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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