Note 2 - Real Estate Investments (Details) - Pro Forma Financial Information - Results of Operations Had the Acquisitions Occured at the Beginning of the Year (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of operations:    
Revenues $ 50,244 $ 50,043
Property operating and other expenses 24,676 25,755
Depreciation and amortization 20,047 19,491
Net income attributable to Retail Opportunity Investments Corp. $ 5,521 $ 4,797