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
Dec. 12, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   $ 61,779,104 $ 48,622,740 $ 56,791,571
Investing Activities        
Principal payments received from notes to subsidiaries $ 237,000 5,000,000 0 0
Net cash provided by investing activities   4,699,066 56,816,490 7,595,477
Financing Activities        
Debt financing costs   (372,759) (264,010) (1,462,741)
Net offering proceeds on Series A preferred stock   0 0 71,161,531
Net offering proceeds on convertible debt   116,355,125 0 0
Cash paid for extinguishment of convertible notes   (78,939,743) 0 0
Repurchases of preferred stock debt   (60,550) (4,275,553) 0
Dividends paid on Series A preferred stock   (9,255,121) (9,587,500) (8,227,734)
Advances on revolving line of credit   0 0 10,000,000
Payments on revolving line of credit   0 0 (54,000,000)
Principal payments on term debt   (3,528,000) (3,528,000) (45,600,577)
Net cash used in financing activities   (14,901,704) (51,939,122) (56,495,063)
Net Change in Cash and Cash Equivalents   51,576,466 53,500,108 7,891,985
Cash and Cash Equivalents at beginning of period   69,287,177 15,787,069 7,895,084
Cash and Cash Equivalents at end of period   120,863,643 69,287,177 15,787,069
Supplemental Disclosure of Cash Flow Information        
Interest Paid   6,834,439 11,200,835 10,780,150
Non-Cash Financing Activities        
Common stock issued upon exchange and conversion of convertible notes   66,064,966 42,654 0
Reinvestment of distributions by common stockholders in additional common shares   403,831 1,509,830 962,308
Parent Company        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities   (939,775) (6,257,124) 1,661,123
Investing Activities        
Principal payments received from notes to subsidiaries   5,587,500 2,250,000 40,092,095
Investment in consolidated subsidiaries   0 (73,996) (33,900,000)
Cash distributions from consolidated subsidiaries   55,416,267 110,140,459 46,774,111
Net cash provided by investing activities   61,003,767 112,316,463 52,966,206
Financing Activities        
Debt financing costs   (372,759) 0 (1,360,241)
Net offering proceeds on Series A preferred stock   0 0 71,161,531
Net offering proceeds on convertible debt   116,355,125 0 0
Cash paid for extinguishment of convertible notes   (78,939,743) 0 0
Repurchases of preferred stock debt   (60,550) (4,275,553) 0
Dividends paid on Series A preferred stock   (9,255,121) (9,587,500) (8,227,734)
Dividends paid on common stock   (39,100,656) (34,284,059) (34,731,892)
Advances on revolving line of credit   0 0 10,000,000
Payments on revolving line of credit   0 0 (54,000,000)
Principal payments on term debt   0 0 (36,740,000)
Net cash used in financing activities   (11,373,704) (48,147,112) (53,898,336)
Net Change in Cash and Cash Equivalents   48,690,288 57,912,227 728,993
Cash and Cash Equivalents at beginning of period   64,574,701 6,662,474 5,933,481
Cash and Cash Equivalents at end of period   113,264,989 64,574,701 6,662,474
Supplemental Disclosure of Cash Flow Information        
Interest Paid   4,504,263 8,794,086 10,080,764
Non-Cash Investing Activities        
Conversion of note receivable from subsidiary to investments   0 0 4,902,495
Dissolution of investment in subsidiary upon liquidation   0 (73,996) 0
Non-Cash Financing Activities        
Common stock issued upon exchange and conversion of convertible notes   66,064,966 42,654 0
Reinvestment of distributions by common stockholders in additional common shares   $ 403,831 $ 1,509,830 $ 962,308