Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

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Acquisitions (Details) - MUSA - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Revenues $ 14,771,010 $ 7,299,734 $ 25,739,242 $ 8,411,926
Pre-tax income (loss) (38,142) 211,703 1,019,497 390,896
Change in fair value of earn-out liability $ 2,307,598 $ 3,391 $ 2,461,658 $ 3,391