Annual report pursuant to Section 13 and 15(d)

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details)

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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Net Cash provided by operating activities $ 51,108,652 $ 42,600,618 $ 16,968,553
Net Cash used in investing activities 479,090 (244,612,616) (177,075,793)
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash dividends paid 39,139,897 23,392,442 18,559,328
Net Cash provided by operating activities (3,141,286) 7,166,380 (2,047,777)
Investment in consolidated subsidiaries 0 (250,703,944) (96,570,263)
Net Cash used in investing activities $ 3,625,306 (217,063,256) $ (168,010,935)
2015 Previously Reported [Member] | Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net Cash provided by operating activities   18,060,382  
Investment in consolidated subsidiaries   (261,597,946)  
Net Cash used in investing activities   (227,957,258)  
Reclassification [Member] | Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net Cash provided by operating activities   (10,894,002)  
Investment in consolidated subsidiaries   10,894,002  
Net Cash used in investing activities   $ 10,894,002