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Acquisitions - Summary of Unaudited Pro Forma Information (Details) - Antenna Plus - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]        
Pro forma sales $ 12,448,436 $ 14,651,565 $ 38,982,040 $ 36,914,879
Pro forma income from operations 200,632 1,869,316 1,047,435 3,865,061
Pro forma net income $ 234,353 $ 1,822,045 $ 1,097,806 $ 4,177,547