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Summarized Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Summarized Quarterly Financial Data (Unaudited) [Abstract]
Revenues	$ 35,439,183	$ 33,507,053	$ 22,787,683	$ 25,289,659	$ 31,376,309	$ 37,462,066	$ 37,991,892	$ 27,914,333	$ 117,023,578	$ 134,744,600
Gross profit	3,616,077	7,221,288	3,464,666	5,653,920	7,545,402	7,330,843	6,889,754	3,765,884	19,955,951	25,531,883
Income from operations	(1,674,877)	2,719,550	764,016	2,871,578	4,632,419	4,731,145	4,168,522	(580,367)	4,680,267	12,951,719
Net income (loss)	$ (1,636,333)	$ 1,572,335	$ 15,917	$ 1,707,869	$ 3,070,724	$ 3,034,542	$ 2,581,606	$ (1,373,896)	$ 1,659,788	$ 7,312,976
Net income per share:
Basic	$ 0.076	$ 0.07	$ 0.001	$ 0.08	$ 0.14	$ 0.14	$ 0.12	$ (0.06)	$ 0.08	$ 0.34
Diluted	$ 0.076	$ 0.07	$ 0.001	$ 0.08	$ 0.14	$ 0.14	$ 0.12	$ (0.06)	$ 0.08	$ 0.34

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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