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Defined Contribution Plan (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Age	Dec. 31, 2011 Age
Defined Contribution Plan (Textual) [Abstract]
Employee Minimum Contribution for compensation	1.00%
Maximum Limited contributions with catchup	$ 22,500	$ 22,000
Maximum Limited contributions	17,000	16,500
Employer matching contributions	$ 0	$ 0
Age requirement under plan	50	50

X

- Definition

Age requirement for catchup contributions.

+ References

No definition available.

+ Details

Name:	bbgi_CatchupContributionsAgeRequirement
Namespace Prefix:	bbgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined contribution plan maximum annual contribution with catchup per employee amount.

+ References

No definition available.

+ Details

Name:	bbgi_DefinedContributionPlanMaximumAnnualContributionWithCatchupPerEmployeeAmount
Namespace Prefix:	bbgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Minimum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	bbgi_DefinedContributionPlanMinimumAnnualContributionPerEmployeePercent
Namespace Prefix:	bbgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	bbgi_DefinedContributionPlanTextualAbstract
Namespace Prefix:	bbgi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum amount per employee, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration