Mortgage Notes Payable, Credit Facilities and Senior Notes - Mortgage Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Long-term debt	$ 70,683	$ 61,683
Mortgage premiums	1,037	922
Net unamortized deferred financing costs	(417)	(449)
Total mortgage notes payable	$ 71,303	62,156
Gateway Village III
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	6.10%
Long-term debt	$ 0	7,166
Bernardo Heights Plaza
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.70%
Long-term debt	$ 8,216	8,404
Santa Teresa Village
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	6.20%
Long-term debt	$ 10,383	10,613
Magnolia Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.50%
Long-term debt	$ 9,135	0
Casitas Plaza Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.32%
Long-term debt	$ 7,449	0
Diamond Hills Plaza
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	3.55%
Long-term debt	$ 35,500	$ 35,500