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Revenue - Trade Sale Revenue (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Trade sales receivable	$ 1,746,064		$ 1,606,283
Trade sales payable	1,170,111		$ 1,250,454
Trade sales revenue	$ 2,248,876	$ 1,882,430

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