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Acquisitions - Summary of Unaudited Pro Forma Information (Details) - Antenna Plus - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Pro forma sales $ 51,789,215 $ 50,940,773
Pro forma income from operations 1,539,538 4,436,281
Pro forma net income $ 1,711,598 $ 4,717,872