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v3.25.3

Net Revenue - Trade Sale Revenue (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Trade sales receivable | $ 1,056,701 |  | $ 1,056,701 |  | $ 1,001,270
Trade sales payable | 489,304 |  | 489,304 |  | $ 479,613
Trade sales revenue | $ 1,189,052 | $ 1,680,660 | $ 4,266,059 | $ 4,156,738 |

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