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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to BBGI stockholders	$ (17,765,922)	$ 13,450,224
Weighted-average shares outstanding:
Basic weighted shares outstanding	28,386,456	27,730,392
Effect of dilutive restricted stock units and restricted stock		47,458
Diluted	28,386,456	27,777,850
Net income (loss) per Class A and Class B common share – basic	$ (0.63)	$ 0.49
Net income (loss) per Class A and Class B common share – diluted	$ (0.63)	$ 0.48

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