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Summarized Quarterly Financial Data (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of quarterly financial information                      
Revenues $ 35,246,348 $ 37,686,114 $ 33,038,512 $ 19,746,656 $ 43,534,781 $ 37,651,354 $ 35,521,672 $ 34,408,999 $ 125,717,630 $ 151,116,806 $ 150,747,316
Gross Profit 7,161,153 8,435,814 6,098,395 1,630,237 6,697,358 6,820,053 5,785,664 7,753,172 23,325,599 27,056,247 32,950,075
Income from Operations 5,325,060 7,563,522 5,211,839 743,071 3,009,214 6,161,418 5,099,534 6,708,500 18,843,492 20,978,666 30,111,345
Net income $ 3,520,613 $ 5,534,844 $ 3,656,136 $ 303,055 $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 13,014,648 $ 14,672,663 $ 21,648,664
Net income per share:                      
Basic $ 0.19 $ 0.30 $ 0.02 $ 0.02 $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.71 $ 0.79 $ 1.18
Diluted $ 0.19 $ 0.30 $ 0.02 $ 0.02 $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.71 $ 0.79 $ 1.18