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Interim Financial Statements - Additional Information (Detail)	Sep. 30, 2020
OutlawsXP Inc [Member]
Equity method investment, ownership percentage	90.00%
Renegades Holdings, Inc. [Member]
Equity method investment, ownership percentage	51.00%

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bbgi_OutlawsxpIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bbgi_RenegadesHoldingsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: