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
May 23, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities     $ 48,622,740 $ 56,791,571 $ 51,108,652
Investing Activities          
Issuance of note to subsidiary     0 0 (202,000)
Principal payments received from notes to subsidiaries $ 237,000   236,867 0 0
Net cash provided by investing activities     56,816,490 7,595,477 479,090
Financing Activities          
Debt financing costs     (264,010) (1,462,741) (193,000)
Net offering proceeds on Series A preferred stock     0 71,161,531 0
Repurchases of common stock     0 0 (2,041,851)
Repurchases of convertible debt   $ (1,000,000) 0 0 (899,960)
Repurchases of Series A preferred stock     (4,275,553) 0 0
Dividends paid on Series A preferred stock     (9,587,500) (8,227,734) (4,148,437)
Dividends paid on common stock     (34,284,059) (34,731,892) (34,896,727)
Advances on revolving line of credit     0 10,000,000 44,000,000
Payments on revolving line of credit     0 (54,000,000) 0
Principal payments on term debt     (3,528,000) (45,600,577) (60,131,423)
Net cash used in financing activities     (51,939,122) (56,495,063) (58,311,398)
Net Change in Cash and Cash Equivalents     53,500,108 7,891,985 (6,723,656)
Cash and Cash Equivalents at beginning of period     15,787,069 7,895,084 14,618,740
Cash and Cash Equivalents at end of period     69,287,177 15,787,069 7,895,084
Supplemental Disclosure of Cash Flow Information          
Interest Paid     11,200,835 10,780,150 12,900,901
Non-Cash Investing Activities          
Conversion of note receivable from subsidiary to investments     42,000    
Non-Cash Financing Activities          
Common stock issued upon conversion of convertible notes     42,654 0 0
Reinvestment of distributions by common stockholders in additional common shares     1,509,830 962,308 815,889
Parent Company          
Condensed Cash Flow Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities     (6,257,124) 1,661,123 (3,141,286)
Investing Activities          
Issuance of note to subsidiary     0 0 (47,414,250)
Principal payments received from notes to subsidiaries     2,250,000 40,092,095 11,899,659
Investment in consolidated subsidiaries     (73,996) (33,900,000) 0
Cash distributions from consolidated subsidiaries     110,140,459 46,774,111 39,139,897
Net cash provided by investing activities     112,316,463 52,966,206 3,625,306
Financing Activities          
Debt financing costs     0 (1,360,241) (193,000)
Net offering proceeds on Series A preferred stock     0 71,161,531 0
Repurchases of common stock     0 0 (2,041,851)
Repurchases of convertible debt     0 0 (899,960)
Repurchases of Series A preferred stock     (4,275,553) 0 0
Dividends paid on Series A preferred stock     (9,587,500) (8,227,734) (4,148,437)
Dividends paid on common stock     (34,284,059) (34,731,892) (34,896,727)
Advances on revolving line of credit     0 10,000,000 44,000,000
Payments on revolving line of credit     0 (54,000,000) 0
Principal payments on term debt     0 (36,740,000) (6,460,000)
Net cash used in financing activities     (48,147,112) (53,898,336) (4,639,975)
Net Change in Cash and Cash Equivalents     57,912,227 728,993 (4,155,955)
Cash and Cash Equivalents at beginning of period     6,662,474 5,933,481 10,089,436
Cash and Cash Equivalents at end of period     64,574,701 6,662,474 5,933,481
Supplemental Disclosure of Cash Flow Information          
Interest Paid     8,794,086 10,080,764 11,335,654
Non-Cash Investing Activities          
Conversion of note receivable from subsidiary to investments     0 4,902,495 0
Dissolution of investment in subsidiary upon liquidation     (73,996) 0 0
Non-Cash Financing Activities          
Common stock issued upon conversion of convertible notes     42,654 0 0
Reinvestment of distributions by common stockholders in additional common shares     $ 1,509,830 $ 962,308 $ 815,889