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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	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Revenue	$ 23,812,036	$ 20,706,460	$ 16,731,951	$ 20,032,701	$ 24,268,033	$ 22,110,829	$ 22,280,964	$ 12,670,032	$ 81,283,148	$ 81,329,858	$ 100,202,557
Gross Profit (loss)	5,512,218	4,912,436	3,683,748	4,537,514	5,899,653	5,024,368	5,034,001	(11,639,104)	18,645,916	4,318,918	16,601,703
Net income (loss)	$ 2,057,173	$ 1,695,513	$ 765,647	$ 1,249,301	$ 2,134,999	$ 1,686,065	$ 1,790,580	$ (9,220,220)	$ 5,767,634	$ (3,608,576)	$ 5,015,993
Income (loss) per common share
Basic (in dollars per share)	$ 0.23	$ 0.19	$ 0.09	$ 0.14	$ 0.24	$ 0.19	$ 0.21	$ (1.07)	$ 0.65	$ 0.42	$ 0.59
Diluted (in dollars per share)	$ 0.23	$ 0.19	$ 0.09	$ 0.14	$ 0.24	$ 0.19	$ 0.21	$ (1.07)	$ 0.65	$ 0.42	$ 0.58

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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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