Annual report pursuant to Section 13 and 15(d)

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Cash Flows (Details)

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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Cash Flows (Details) - USD ($)
 12 Months Ended
May 23, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   $ 51,108,652 $ 42,600,618 $ 16,968,553
Proceeds from assets and liabilities held for sale   644,934 7,678,246 0
Issuance of note to subsidiary   (202,000) (524,037) (20,648,714)
Principal payment on financing note receivable   0 100,000 0
Net cash provided (used) by investing activities   479,090 (244,612,616) (177,075,793)
Debt financing costs   (193,000) (1,617,991) (3,269,429)
Net offering proceeds on Series A preferred stock   0 54,210,476 0
Net offering proceeds on common stock   0 73,184,679 141,797,913
Net offering proceeds on convertible debt   0 111,262,500 0
Repurchases of common stock   (2,041,851) 0 0
Repurchases of convertible debt $ (1,000,000) (899,960) 0 0
Dividends paid on Series A preferred stock   (4,148,437) (3,503,125) 0
Dividends paid on common stock   (34,896,727) (28,528,224) (15,187,976)
Advances on revolving line of credit   44,000,000 45,392,332 34,676,948
Payments on revolving line of credit   0 (77,533,609) (2,617,606)
Proceeds from term debt   0 45,000,000 0
Net cash (used) provided by financing activities   (58,311,398) 209,052,574 149,722,138
Net Change in Cash and Cash Equivalents   (6,723,656) 7,040,576 (10,385,102)
Cash and Cash Equivalents at beginning of period   14,618,740 7,578,164 17,963,266
Cash and Cash Equivalents at end of period   7,895,084 14,618,740 7,578,164
Parent Company [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   (3,141,286) 7,166,380 (2,047,777)
Proceeds from assets and liabilities held for sale   0 7,678,246 0
Issuance of note to subsidiary   (47,414,250) 0 (90,000,000)
Principal payment on financing note receivable   11,899,659 2,570,000 0
Investment in consolidated subsidiaries   0 (250,703,944) (96,570,263)
Cash distributions from consolidated subsidiaries   39,139,897 23,392,442 18,559,328
Net cash provided (used) by investing activities   3,625,306 (217,063,256) (168,010,935)
Debt financing costs   (193,000) (1,439,929) (1,600,908)
Net offering proceeds on Series A preferred stock   0 54,210,476 0
Net offering proceeds on common stock   0 73,184,679 141,797,913
Net offering proceeds on convertible debt   0 111,262,500 0
Repurchases of common stock   (2,041,851) 0 0
Repurchases of convertible debt   (899,960) 0 0
Dividends paid on Series A preferred stock   (4,148,437) (3,503,125) 0
Dividends paid on common stock   (34,896,727) (28,528,224) (15,187,976)
Advances on revolving line of credit   44,000,000 42,000,000 32,000,000
Payments on revolving line of credit   0 (74,000,000) 0
Proceeds from term debt   0 45,000,000 0
Principal payments on term debt   (6,460,000) (1,800,000) 0
Net cash (used) provided by financing activities   (4,639,975) 216,386,377 157,009,029
Net Change in Cash and Cash Equivalents   (4,155,955) 6,489,501 (13,049,683)
Cash and Cash Equivalents at beginning of period   10,089,436 3,599,935 16,649,618
Cash and Cash Equivalents at end of period   $ 5,933,481 $ 10,089,436 $ 3,599,935