Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Benefit (Details)

v3.8.0.1
Income Taxes - Income Tax Benefit (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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                 $ 12,231,838 $ 10,219,573 $ 3,630,325
State income taxes, net of federal tax benefit                 352,708 26,215 (134,597)
Income of Real Estate Investment Trust not subject to tax                 (11,975,853) (10,663,371) (5,189,849)
Tax reform impact                 1,262,444 0 0
Other                 474,181 (46,837) (253,432)
Income tax expense (benefit), net $ 2,390,618 $ 191,571 $ 95,735 $ (332,606) $ (102,884) $ 483,152 $ 410,438 $ (1,255,126) $ 2,345,318 $ (464,420) $ (1,947,553)