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Note 15 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 15 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership [Line Items]                      
Total revenues $ 41,742,670us-gaap_Revenues $ 40,855,871us-gaap_Revenues $ 36,914,834us-gaap_Revenues $ 36,350,136us-gaap_Revenues $ 33,636,485us-gaap_Revenues $ 27,147,631us-gaap_Revenues $ 26,063,466us-gaap_Revenues $ 24,384,449us-gaap_Revenues $ 155,863,511us-gaap_Revenues $ 111,232,031us-gaap_Revenues $ 75,095,687us-gaap_Revenues
Net income attributable to the Operating Partnership 4,751,521us-gaap_ProfitLoss 6,980,696us-gaap_ProfitLoss 6,050,762us-gaap_ProfitLoss 3,266,243us-gaap_ProfitLoss 3,955,264us-gaap_ProfitLoss 25,262,291us-gaap_ProfitLoss 2,471,012us-gaap_ProfitLoss 2,289,886us-gaap_ProfitLoss 21,049,222us-gaap_ProfitLoss 33,978,453us-gaap_ProfitLoss 7,892,613us-gaap_ProfitLoss
Basic income per unit $ 0.05us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.50us-gaap_EarningsPerShareBasic $ 0.15us-gaap_EarningsPerShareBasic
Diluted income per unit $ 0.05us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted $ 0.34us-gaap_EarningsPerShareDiluted $ 0.03us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.48us-gaap_EarningsPerShareDiluted $ 0.15us-gaap_EarningsPerShareDiluted
Retail Opportunity Investments Partnership L.P. [Member]                      
Note 15 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for the Operating Partnership [Line Items]                      
Total revenues 41,742,670us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
40,855,871us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
36,914,834us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
36,350,136us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
33,636,485us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
27,147,631us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
26,063,466us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
24,384,449us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
155,863,511us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
111,232,031us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
75,095,687us-gaap_Revenues
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
Net income attributable to the Operating Partnership $ 4,751,521us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 6,980,696us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 6,050,762us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 3,266,243us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 3,955,264us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 25,262,291us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 2,471,012us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 2,289,886us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 21,049,222us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 33,978,453us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 7,892,613us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
Basic income per unit $ 0.05us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.07us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.07us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.04us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.05us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.35us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.04us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.04us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.24us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.50us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.15us-gaap_EarningsPerShareBasic
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
Diluted income per unit $ 0.05us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.07us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.07us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.04us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.05us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.34us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.03us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.04us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.24us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.48us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember
$ 0.15us-gaap_EarningsPerShareDiluted
/ dei_LegalEntityAxis
= roic_RetailOpportunityInvestmentsPartnershipLPMember