Name:	roic_DeferredChargesAmortizationExpenseAfterYearFive
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense for deferred charges during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	roic_DeferredChargesAmortizationExpenseNextTwelveMonths
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense for deferred charges to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	roic_DeferredChargesAmortizationExpenseYearFive
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense for deferred charges to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	roic_DeferredChargesAmortizationExpenseYearFour
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense for deferred charges to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	roic_DeferredChargesAmortizationExpenseYearThree
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense for deferred charges to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	roic_DeferredChargesAmortizationExpenseYearTwo
Namespace Prefix:	roic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	roic_Note1OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesDetailsUnamortizedBalancesofDeferredChargesLineItems
Namespace Prefix:	roic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The carrying amount of deferred costs.

No definition available.