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, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   $ 56,791,571 $ 51,108,652 $ 42,600,618
Investing Activities        
Proceeds from assets and liabilities held for sale   0 644,934 7,678,246
Issuance of note to subsidiary   0 (202,000) (524,037)
Principal payment on financing note receivable   0 0 100,000
Net cash provided by (used in) investing activities   7,595,477 479,090 (244,612,616)
Financing Activities        
Debt financing costs   (1,462,741) (193,000) (1,617,991)
Net offering proceeds on Series A preferred stock   71,161,531 0 54,210,476
Net offering proceeds on common stock   0 0 73,184,679
Net offering proceeds on convertible debt   0 0 111,262,500
Repurchases of common stock   0 (2,041,851) 0
Repurchases of convertible debt $ (1,000,000) 0 (899,960) 0
Dividends paid on Series A preferred stock   (8,227,734) (4,148,437) (3,503,125)
Dividends paid on common stock   (34,731,892) (34,896,727) (28,528,224)
Advances on revolving line of credit   10,000,000 44,000,000 45,392,332
Payments on revolving line of credit   (54,000,000) 0 (77,533,609)
Proceeds from term debt   41,000,000 0 45,000,000
Principal payments on term debt   (45,600,577) (60,131,423) (6,328,000)
Net cash (used in) provided by financing activities   (56,495,063) (58,311,398) 209,052,574
Net Change in Cash and Cash Equivalents   7,891,985 (6,723,656) 7,040,576
Cash and Cash Equivalents at beginning of period   7,895,084 14,618,740 7,578,164
Cash and Cash Equivalents at end of period   15,787,069 7,895,084 14,618,740
Supplemental Disclosure of Cash Flow Information        
Interest paid   10,780,150 12,900,901 7,873,333
Income taxes paid (net of refunds)   199,772 37,736 747,406
Non-Cash Financing Activities        
Change in accounts payable and accrued expenses related to the issuance of common equity   0 0 (72,685)
Change in accounts payable and accrued expenses related to debt financing costs   255,037 0 (43,039)
Reinvestment of distributions by common stockholders in additional common shares   962,308 815,889 817,915
Parent Company [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   1,661,123 (3,141,286) 7,166,380
Investing Activities        
Proceeds from assets and liabilities held for sale   0 0 7,678,246
Issuance of note to subsidiary   0 (47,414,250) 0
Principal payment on financing note receivable   40,092,095 11,899,659 2,570,000
Investment in consolidated subsidiaries   (33,900,000) 0 (250,703,944)
Cash distributions from consolidated subsidiaries   46,774,111 39,139,897 23,392,442
Net cash provided by (used in) investing activities   52,966,206 3,625,306 (217,063,256)
Financing Activities        
Debt financing costs   (1,360,241) (193,000) (1,439,929)
Net offering proceeds on Series A preferred stock   71,161,531 0 54,210,476
Net offering proceeds on common stock   0 0 73,184,679
Net offering proceeds on convertible debt   0 0 111,262,500
Repurchases of common stock   0 (2,041,851) 0
Repurchases of convertible debt   0 (899,960) 0
Dividends paid on Series A preferred stock   (8,227,734) (4,148,437) (3,503,125)
Dividends paid on common stock   (34,731,892) (34,896,727) (28,528,224)
Advances on revolving line of credit   10,000,000 44,000,000 42,000,000
Payments on revolving line of credit   (54,000,000) 0 (74,000,000)
Proceeds from term debt   0 0 45,000,000
Principal payments on term debt   (36,740,000) (6,460,000) (1,800,000)
Net cash (used in) provided by financing activities   (53,898,336) (4,639,975) 216,386,377
Net Change in Cash and Cash Equivalents   728,993 (4,155,955) 6,489,501
Cash and Cash Equivalents at beginning of period   5,933,481 10,089,436 3,599,935
Cash and Cash Equivalents at end of period   6,662,474 5,933,481 10,089,436
Supplemental Disclosure of Cash Flow Information        
Interest paid   10,080,764 11,335,654 5,254,591
Income taxes paid (net of refunds)   0 0 314,728
Non-Cash Investing Activities        
Conversion of note receivable from subsidiary to investments   4,902,495 0 0
Non-Cash Financing Activities        
Change in accounts payable and accrued expenses related to the issuance of common equity   0 0 (72,685)
Change in accounts payable and accrued expenses related to debt financing costs   0 0 (30,607)
Reinvestment of distributions by common stockholders in additional common shares   $ 962,308 $ 815,889 $ 817,915