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Quarterly Financial Data (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information [Line Items]                      
Revenue $ 19,154,000 $ 17,850,000 $ 17,219,000 $ 15,743,000 $ 14,323,000 $ 13,757,000 $ 12,904,000 $ 12,575,000 $ 69,965,866 $ 53,558,857 $ 43,517,664
Net Income $ 7,927,000 $ 14,876,000 $ 10,465,000 $ 6,494,000 $ 5,723,000 $ 4,966,000 $ 2,716,000 $ 5,509,000 $ 39,762,455 $ 18,913,009 $ 20,189,611
Earnings per Share - diluted (in dollars per share) $ 0.41 $ 0.81 $ 0.58 $ 0.36 $ 0.36 $ 0.33 $ 0.18 $ 0.37 $ 2.16 $ 1.24 $ 1.50