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Summarized Quarterly Financial Data (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summarized Quarterly Financial Data (Unaudited) [Abstract]                      
Revenues $ 31,376,309 $ 37,462,066 $ 37,991,892 $ 27,914,333 $ 35,108,810 $ 32,406,877 $ 41,283,142 $ 26,504,344 $ 134,744,600 $ 135,303,173 $ 137,041,447
Gross Profit 7,545,402 7,330,843 6,889,754 3,765,884 5,973,797 6,416,561 10,483,514 4,986,733 25,531,883 27,860,605 22,778,148
Income (Loss) from Operations 4,632,419 4,731,145 4,168,522 (580,367) 3,665,106 2,601,779 8,649,545 3,280,340 12,951,719 18,196,770 17,412,906
Net income (loss) $ 3,070,724 $ 3,034,542 $ 2,581,606 $ (1,373,896) $ 2,160,289 $ 1,685,897 $ 5,590,530 $ 2,105,489 $ 7,312,976 $ 11,542,205 $ 11,706,360
Net income (loss) per share:                      
Basic $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.11 $ 0.08 $ 0.28 $ 0.1 $ 0.34 $ 0.57 $ 0.61
Diluted $ 0.14 $ 0.14 $ 0.12 $ (0.06) $ 0.11 $ 0.08 $ 0.28 $ 0.1 $ 0.34 $ 0.57 $ 0.61