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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 13,450,224	$ 6,481,049
Weighted-average shares outstanding:
Basic	27,730,392	27,444,110
Effect of dilutive restricted stock	47,458	89,873
Diluted	27,777,850	27,533,983
Net income attributable to BBGI stockholders per Class A and Class B common share – basic	$ 0.49	$ 0.24
Net income attributable to BBGI stockholders per Class A and Class B common share – diluted	$ 0.48	$ 0.24

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