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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic income (loss) per share
Net income (loss) attributable to BBGI stockholders	$ (2,385,398)	$ 3,043,899	$ (28,956,920)	$ 8,666,163
Basic weighted shares outstanding	29,154,148	27,781,412	28,362,512	27,706,759
Net income (loss) per share—basic	$ (0.08)	$ 0.11	$ (1.02)	$ 0.31
Diluted income (loss) per share
Net income (loss) attributable to BBGI stockholders	$ (2,385,398)	$ 3,043,899	$ (28,956,920)	$ 8,666,163
Basic weighted shares outstanding	29,154,148	27,781,412	28,362,512	27,706,759
Effect of restricted stock and restricted stock units under the treasury stock method		101,062		121,557
Diluted weighted shares outstanding	29,154,148	27,882,474	28,362,512	27,828,316
Net income (loss) per share—diluted	$ (0.08)	$ 0.11	$ (1.02)	$ 0.31

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