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Revenue - Trade Sale Revenue (Detail) - USD ($) | 12 Months Ended
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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

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- 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