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Income Taxes - Reconciliation of Statutory Federal Income Tax Provision (Benefit) (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Statutory federal income tax provision (benefit) $ 311,313 $ 1,046,484
Effect of non-taxable REIT income (loss) (104,294) (941,641)
State income tax provision (benefit) 98,936 67,094
Income tax provision $ 305,955 $ 171,937