Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Income Tax Expense (Benefit) (Details)

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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Total income tax expense (benefit) differs from the amount computed by applying the federal statutory income tax rates net investment income and net realized and unrealized gains on investments        
Application of statutory income tax rate $ 3,279,099 $ 3,400,018 $ 9,005,926 $ 7,425,354
State income taxes, net of federal tax expense (benefit) 8,784 28,642 (22,867) (29,384)
Federal Tax Attributable to Income of Real Estate Investment Trust (3,096,312) (2,945,508) (9,028,359) (7,757,506)
Income tax expense (benefit), net $ 191,571 $ 483,152 $ (45,300) $ (361,536)