Mortgage Notes Payable, Credit Facilities and Senior Notes - Mortgage Notes Payable (Details) - Notes Payable - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Long-term debt	$ 86,157	$ 86,708
Mortgage premiums	1,594	2,074
Net unamortized deferred financing costs	(228)	(271)
Total mortgage notes payable	$ 87,523	88,511
Casitas Plaza Shopping Center
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	5.32%
Long-term debt	$ 7,001	7,158
Riverstone Marketplace
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.96%
Long-term debt	$ 17,656	18,050
Fullerton Crossroads
Mortgage Notes Payable, Credit Facilities and Senior Notes [Line Items]
Interest Rate (in percentage)	4.728%
Long-term debt	$ 26,000	26,000
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