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Income Taxes - Reconciliation of Statutory Federal Income Tax Provision (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Statutory federal income tax provision $ 446,175 $ 846,728 $ 1,492,659 $ 884,057
Effect of non-taxable REIT income (323,416) (224,433) (1,265,057) (738,696)
State income tax provision (benefit) 73,724 (109,468) 140,818 (68,614)
Income tax provision $ 196,483 $ 512,827 $ 368,420 $ 76,747