Revenue, Segment and Geographic Information - Schedule of (Loss) Income from Operations by Reporting Segments (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenue	$ 15,984,293	$ 12,976,058	$ 44,205,054	$ 37,961,023
Cost of revenues	(10,467,590)	(8,074,445)	(29,602,823)	(26,338,527)
Gross profit	$ 5,516,703	$ 4,901,613	$ 14,602,231	$ 11,622,496
Gross margin %	34.50%	37.80%	33.00%	30.60%
Total operating expenses	$ (4,490,424)	$ (3,922,171)	$ (12,784,271)	$ (12,560,094)
Income (loss) from operations	1,026,279	979,442	1,817,960	(937,598)	$ (424,281)
OSS Segment
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenue	9,263,796	8,976,539	26,968,202	24,722,066
Cost of revenues	(5,468,204)	(4,976,063)	(16,572,433)	(15,899,150)
Gross profit	$ 3,795,592	$ 4,000,476	$ 10,395,769	$ 8,822,916
Gross margin %	41.00%	44.60%	38.50%	35.70%
Total operating expenses	$ (3,562,174)	$ (3,052,949)	$ (9,986,391)	$ (9,883,997)
Income (loss) from operations	233,418	947,527	409,378	(1,061,081)
Bressner Segment
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenue	6,720,497	3,999,519	17,236,852	13,238,957
Cost of revenues	(4,999,386)	(3,098,382)	(13,030,390)	(10,439,377)
Gross profit	$ 1,721,111	$ 901,137	$ 4,206,462	$ 2,799,580
Gross margin %	25.60%	22.50%	24.40%	21.10%
Total operating expenses	$ (928,250)	$ (869,222)	$ (2,797,880)	$ (2,676,097)
Income (loss) from operations	$ 792,861	$ 31,915	$ 1,408,582	$ 123,483