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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to BBGI stockholders	$ 187,694	$ (17,734,961)	$ (10,367,698)	$ (26,571,522)
Weighted-average shares outstanding:
Basic	29,235,009	27,977,113	29,268,717	27,962,345
Effect of dilutive restricted stock units and restricted stock	89,605	0		0
Diluted	29,324,614	27,977,113	29,268,717	27,962,345
Net income (loss) attributable to BBGI stockholders per Class A and Class B common share – basic and diluted	$ 0.01	$ (0.63)	$ (0.35)	$ (0.95)

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Net income loss attributable to BBGI stockholders

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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