Summary of Significant Accounting Policies - Cash and Restricted Cash (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item property	Dec. 31, 2015 USD ($) item property	Dec. 31, 2014 property	Dec. 31, 2013 item	Jan. 31, 2013 property
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents maximum original maturity period	90 days
Restricted Cash	$ 9,855,469	$ 14,060,523
Number of income properties acquired | property	10	4	4
Escrow Deposit to be Reinvested Through Like-Kind Exchange Structure
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 8,200,000
Restricted Cash Reserve for Property Taxes and Insurance Escrows for Property Financing
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	172,000
Number of income properties acquired | property					2
Restricted Cash, Escrow Deposit Related to Land Transactions
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 432,000
Number of separate escrow accounts | item	3
Number of separate land transactions | item	3
Number of closed land transactions | item		2		1
Winter Park, Florida | Restricted Cash, Escrow for Tenant Improvements | The Grove
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 375,000
Katy, Texas | Restricted Cash, Escrow for Tenant Improvements | Lowes
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 659,000