Retail Opportunity Investments (ROIC) 10-K 25 Feb 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	Retail Opportunity Investments Corp
Document Type	10-K
Current Fiscal Year End Date	-19
Entity Common Stock, Shares Outstanding		93,306,923
Entity Public Float			$1,400,000,000
Amendment Flag	FALSE
Entity Central Index Key	1407623
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014		Dec. 31, 2013
ASSETS
Land	$550,078,150		$458,252,028
Building and improvements	1,235,820,156		914,181,620
Total real estate investments	1,785,898,306	[1]	1,372,433,648
Less: accumulated depreciation	88,173,334		57,499,980
Real Estate Investments, net	1,697,724,972		1,314,933,668
Cash and cash equivalents	10,773,406		7,919,697
Restricted cash	513,918		1,298,666
Tenant and other receivables	23,024,678		20,389,068
Deposits	4,500,100		775,000
Acquired lease intangible asset, net of accumulated amortization	71,432,664		55,887,471
Prepaid expenses	2,454,341		1,371,296
Deferred charges, net of accumulated amortization	39,730,973		33,121,980
Other	1,541,333		3,392,997
Total assets	1,851,696,385		1,439,089,843
Liabilities:
Term loan			200,000,000
Credit facility	156,500,000		56,950,000
Mortgage notes payable	94,183,258		118,903,258
Acquired lease intangibles liability, net of accumulated amortization	118,358,661		85,283,882
Accounts payable and accrued expenses	12,173,382		11,923,998
Tenants' security deposits	3,960,699		3,422,910
Other liabilities	11,043,126		11,350,409
Total liabilities	888,914,167		733,679,777
Commitments and contingencies
Equity:
Preferred stock, $.0001 par value 50,000,000 shares authorized; none issued and outstanding	0		0
Common stock, $.0001 par value 500,000,000 shares authorized; and 92,991,333 and 72,445,767 shares issued and outstanding at December 31, 2014 and 2013, respectively	9,293		7,238
Additional paid-in-capital	1,013,561,443		732,701,858
Dividends in excess of earnings	-80,975,650		-47,616,570
Accumulated other comprehensive loss	-8,882,417		-8,969,137
Total Retail Opportunity Investments Corp. stockholders' equity	923,712,669		676,123,389
Non-controlling interests	39,069,549		29,286,677
Total equity	962,782,218		705,410,066
Total liabilities and equity	1,851,696,385		1,439,089,843
Senior Notes 2023 [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Liabilities:
Senior Notes	246,173,927		245,845,320
Senior Notes 2023 [Member]
Liabilities:
Senior Notes	246,173,927		245,845,320
Senior Notes 2024 [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Liabilities:
Senior Notes	246,521,114
Senior Notes 2024 [Member]
Liabilities:
Senior Notes	246,521,114
Retail Opportunity Investments Partnership L.P. [Member]
ASSETS
Land	550,078,150		458,252,028
Building and improvements	1,235,820,156		914,181,620
Total real estate investments	1,785,898,306		1,372,433,648
Less: accumulated depreciation	88,173,334		57,499,980
Real Estate Investments, net	1,697,724,972		1,314,933,668
Cash and cash equivalents	10,773,406		7,919,697
Restricted cash	513,918		1,298,666
Tenant and other receivables	23,024,678		20,389,068
Deposits	4,500,100		775,000
Acquired lease intangible asset, net of accumulated amortization	71,432,664		55,887,471
Prepaid expenses	2,454,341		1,371,296
Deferred charges, net of accumulated amortization	39,730,973		33,121,980
Other	1,541,333		3,392,997
Total assets	1,851,696,385		1,439,089,843
Liabilities:
Term loan			200,000,000
Credit facility	156,500,000		56,950,000
Mortgage notes payable	94,183,258		118,903,258
Acquired lease intangibles liability, net of accumulated amortization	118,358,661		85,283,882
Accounts payable and accrued expenses	12,173,382		11,923,998
Tenants' security deposits	3,960,699		3,422,910
Other liabilities	11,043,126		11,350,409
Total liabilities	888,914,167		733,679,777
Equity:
ROIC capital (consists of general and limited partnership interests held by ROIC)	932,595,086		685,092,526
Limited partners’ capital (consists of limited partnership interests held by third parties)	39,069,549		29,286,677
Accumulated other comprehensive loss	-8,882,417		-8,969,137
Total equity	962,782,218		705,410,066
Total liabilities and equity	$1,851,696,385		$1,439,089,843
[1]	RECONCILIATION OF REAL ESTATE - OWNED SUBJECT TO OPERATING LEASESYear Ended December 31,2014 2013 2012Balance at beginning of period: $ 1,372,433,648 $ 871,693,595 $ 580,832,410Property improvements during the year 27,514,974 19,513,924 12,264,027Properties acquired during the year 416,297,696 487,309,488 278,597,158Properties sold during the year (23,675,678) (6,083,359) -Assets written off during the year (6,672,334) - -Balance at end of period: $ 1,785,898,306 $ 1,372,433,648 $ 871,693,595

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred stock par value (in Dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	92,991,333	72,445,767
Common stock, shares outstanding	92,991,333	72,445,767

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Base rents	$119,841,623	$86,194,511	$59,218,635
Recoveries from tenants	32,945,321	22,497,745	13,483,825
Mortgage interest		623,793	1,106,089
Other income	3,076,567	1,915,982	1,287,138
Total revenues	155,863,511	111,232,031	75,095,687
Operating expenses
Property operating	25,035,765	19,749,972	12,779,758
Property taxes	15,953,210	11,246,967	7,281,213
Depreciation and amortization	58,434,981	40,397,895	29,074,709
General and administrative expenses	11,199,632	10,058,669	12,734,254
Acquisition transaction costs	961,167	1,688,521	1,347,611
Other expenses	504,828	314,833	324,354
Total operating expenses	112,089,583	83,456,857	63,541,899
Operating income	43,773,928	27,775,174	11,553,788
Interest expense and other finance expenses	-27,593,259	-15,854,978	-11,379,857
Gain on consolidation of joint venture		20,381,849	2,144,696
Gain on bargain purchase			3,864,145
Equity in earnings from unconsolidated joint ventures		2,389,937	1,697,980
Gain on sale of real estate	4,868,553
Interest income			11,861
Income from continuing operations	21,049,222	34,691,982	7,892,613
Loss from discontinued operations		-713,529
Net Income Attributable to Retail Opportunity Investments Partnership, LP	21,049,222	33,978,453	7,892,613
Net income attributable to non-controlling interest	-748,177	-164,892
Net Income Attributable to Retail Opportunity Investments Corp.	20,301,045	33,813,561	7,892,613
Net income per share - basic:
Income from continuing operations (in Dollars per share)	$0.24	$0.51	$0.15
Loss from discontinued operations (in Dollars per share)		($0.01)
Net earnings per share (in Dollars per share)	$0.24	$0.50	$0.15
Net income per share - diluted:
Income from continuing operations (in Dollars per share)	$0.24	$0.49	$0.15
Loss from discontinued operations (in Dollars per share)		($0.01)
Net earnings per share (in Dollars per share)	$0.24	$0.48	$0.15
Dividends per common share (in Dollars per share)	$0.64	$0.60	$0.53
Comprehensive income:
Net income	21,049,222	33,978,453	7,892,613
Unrealized gain (loss) on swap derivative
Unrealized swap derivative gain (loss) arising during the period	-3,131,969	4,564,248	-7,859,264
Reclassification adjustment for amortization of interest expense included in net income	3,218,689	4,621,227	3,799,482
Other comprehensive income (loss)	86,720	9,185,475	-4,059,782
Comprehensive income (loss)	21,135,942	43,163,928	3,832,831
Comprehensive income attributable to non-controlling interests	-748,177	-164,892
Comprehensive income attributable to Retail Opportunity Investments Corp.	20,387,765	42,999,036	3,832,831
Retail Opportunity Investments Partnership L.P. [Member]
Revenues
Base rents	119,841,623	86,194,511	59,218,635
Recoveries from tenants	32,945,321	22,497,745	13,483,825
Mortgage interest		623,793	1,106,089
Other income	3,076,567	1,915,982	1,287,138
Total revenues	155,863,511	111,232,031	75,095,687
Operating expenses
Property operating	25,035,765	19,749,972	12,779,758
Property taxes	15,953,210	11,246,967	7,281,213
Depreciation and amortization	58,434,981	40,397,895	29,074,709
General and administrative expenses	11,199,632	10,058,669	12,734,254
Acquisition transaction costs	961,167	1,688,521	1,347,611
Other expenses	504,828	314,833	324,354
Total operating expenses	112,089,583	83,456,857	63,541,899
Operating income	43,773,928	27,775,174	11,553,788
Interest expense and other finance expenses	-27,593,259	-15,854,978	-11,379,857
Gain on consolidation of joint venture		20,381,849	2,144,696
Gain on bargain purchase			3,864,145
Equity in earnings from unconsolidated joint ventures		2,389,937	1,697,980
Gain on sale of real estate	4,868,553
Interest income			11,861
Income from continuing operations	21,049,222	34,691,982	7,892,613
Loss from discontinued operations		-713,529
Net Income Attributable to Retail Opportunity Investments Partnership, LP	21,049,222	33,978,453	7,892,613
Net income per share - basic:
Income from continuing operations (in Dollars per share)	$0.24	$0.51	$0.15
Loss from discontinued operations (in Dollars per share)		($0.01)
Net earnings per share (in Dollars per share)	$0.24	$0.50	$0.15
Net income per share - diluted:
Income from continuing operations (in Dollars per share)	$0.24	$0.49	$0.15
Loss from discontinued operations (in Dollars per share)		($0.01)
Net earnings per share (in Dollars per share)	$0.24	$0.48	$0.15
Dividends per common share (in Dollars per share)	$0.64	$0.60	$0.53
Comprehensive income:
Net income	21,049,222	33,978,453	7,892,613
Unrealized gain (loss) on swap derivative
Unrealized swap derivative gain (loss) arising during the period	-3,131,969	4,564,248	-7,859,264
Reclassification adjustment for amortization of interest expense included in net income	3,218,689	4,621,227	3,799,482
Other comprehensive income (loss)	86,720	9,185,475	-4,059,782
Comprehensive income (loss)	$21,135,942	$43,163,928	$3,832,831

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	ATM Equity Offering Sales Agreement [Member]	ATM Equity Offering Sales Agreement [Member]	ATM Equity Offering Sales Agreement [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Cash Redemption for Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]	Officer [Member]	Total
	Common Stock [Member]	Additional Paid-in Capital [Member]				Officer [Member]			Cash Redemption for Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]
Balance at December 31, 2011 at Dec. 31, 2011				$4,938	$484,194,434		($19,617,877)	($14,094,830)			$2,389				$450,489,054
Balance at December 31, 2011 (in Shares) at Dec. 31, 2011				49,375,738
Shares issued under the 2009 Plan				22											22
Shares issued under the 2009 Plan (in Shares)				224,067
Repurchase of common stock				-6	-708,170										-708,176
Repurchase of common stock (in Shares)				-55,496
Stock based compensation expense					3,393,439										3,393,439
Proceeds from the sale of stock	306	37,811,352	37,811,658
Proceeds from the sale of stock (in Shares)	3,051,445
Registration expenditures					-1,162,787										-1,162,787
Proceeds from the exercise of warrants					12,000										12,000
Proceeds from the exercise of warrants (in Shares)				1,000
Cash dividends						-68,475	-27,057,495							-68,475	-27,057,495
Dividends payable to officers						-68,475	-27,057,495							-68,475	-27,057,495
Net income attributable to Retail Opportunity Investments Corp.							7,892,613								7,892,613
Other comprehensive loss								-4,059,782							-4,059,782
Balance at Dec. 31, 2012				5,260	523,540,268		-38,851,234	-18,154,612			2,389				466,542,071
Balance (in Shares) at Dec. 31, 2012				52,596,754
Shares issued under the 2009 Plan				31	-31
Shares issued under the 2009 Plan (in Shares)				313,364
Repurchase of common stock				-3	-406,539										-406,542
Repurchase of common stock (in Shares)				-30,333
Retirement of options					-274,830										-274,830
Stock based compensation expense					2,856,391										2,856,391
Registration expenditures					-69,245										-69,245
Proceeds from the exercise of warrants				1,882	226,527,896										226,529,778
Proceeds from the exercise of warrants (in Shares)				18,877,482
Exercise of Sponsor warrants				68	-68
Exercise of Sponsor warrants (in Shares)				688,500
Buyback of warrants					-32,785,921										-32,785,921
Issuance of OP Units to non-controlling interests											45,372,731				45,372,731
Distributions to non-controlling interests											-277,424				-277,424
Decrease in non-controlling interests									-2,189,779	-2,389		-2,189,779	-2,389
Adjustment to non-controlling interests ownership in Operating Partnership					13,313,937						-13,313,937
Cash dividends						-110,000	-42,468,897				-469,806			-110,000	-42,938,703
Dividends payable to officers						-110,000	-42,468,897				-469,806			-110,000	-42,938,703
Net income attributable to Retail Opportunity Investments Corp.							33,813,561								33,813,561
Net income attributable to non-controlling interests											164,892				164,892
Other comprehensive loss								9,185,475							9,185,475
Balance at Dec. 31, 2013				7,238	732,701,858		-47,616,570	-8,969,137			29,286,677				705,410,066
Balance (in Shares) at Dec. 31, 2013				72,445,767											72,445,767
Shares issued under the 2009 Plan				34	-34
Shares issued under the 2009 Plan (in Shares)				340,621
Repurchase of common stock				-4	-630,891										-630,895
Repurchase of common stock (in Shares)				-42,438											0
Cancellation of restricted stock (in Shares)				-5,833
Stock based compensation expense					3,662,034										3,662,034
Proceeds from the sale of stock				1,438	214,904,813										214,906,251
Proceeds from the sale of stock (in Shares)			0	14,375,000
Registration expenditures					-9,633,785										-9,633,785
Proceeds from the exercise of warrants				587	70,538,004										70,538,591
Proceeds from the exercise of warrants (in Shares)				5,878,216
Issuance of OP Units to non-controlling interests											16,342,775				16,342,775
Decrease in non-controlling interests									-3,280,000			-3,280,000
Adjustment to non-controlling interests ownership in Operating Partnership					2,019,444						-2,019,444
Cash dividends						-137,864	-53,522,261				-2,008,636			-137,864	-55,530,897
Dividends payable to officers						-137,864	-53,522,261				-2,008,636			-137,864	-55,530,897
Net income attributable to Retail Opportunity Investments Corp.							20,301,045								20,301,045
Net income attributable to non-controlling interests											748,177				748,177
Other comprehensive loss								86,720							86,720
Balance at Dec. 31, 2014				$9,293	$1,013,561,443		($80,975,650)	($8,882,417)			$39,069,549				$962,782,218
Balance (in Shares) at Dec. 31, 2014				92,991,333											92,991,333

Consolidated_Statements_of_Equ1

Consolidated Statements of Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends per share	$0.64	$0.60	$0.53
Retained Earnings [Member]
Dividends per share	$0.64	$0.60	$0.53

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$21,049,222	$33,978,453	$7,892,613
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	58,434,981	40,397,895	29,074,709
Amortization of deferred financing costs and mortgage premiums, net	-432,327	-144,313	494,843
Gain on consolidation of joint venture		-20,381,849	-2,144,696
Gain on bargain purchase			-3,864,145
Straight-line rent adjustment	-3,794,936	-3,733,913	-3,040,510
Amortization of above and below market rent	-6,944,572	-4,444,117	-3,659,011
Amortization relating to stock based compensation	3,662,034	2,856,391	3,393,439
Provisions for tenant credit losses	2,315,972	1,621,940	1,160,568
Equity earned in earnings from unconsolidated joint ventures		-2,389,937	-1,697,980
Other noncash interest expense	1,847,640
Gain on sale of real estate	-4,868,553
Loss on sale of discontinued operations		713,529
Settlement of interest rate swap agreements	-3,230,000	-8,750,000
Distribution of cumulative earnings from unconsolidated joint ventures			686,017
Other		792,244
Change in operating assets and liabilities
Restricted cash	190,011	74,083	-225,245
Tenant and other receivables	-1,604,811	-4,820,044	-3,679,442
Prepaid expenses	-1,106,227	-104,814	-573,099
Accounts payable and accrued expenses	-1,164,032	2,942,797	-1,912,490
Other asset and liabilities, net	852,525	-855,880	2,814,995
Net cash provided by operating activities	65,206,927	37,752,465	24,720,566
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in real estate	-398,205,203	-289,399,034	-255,851,952
Acquisition of entities		-43,378,106
Proceeds from sale of real estate	27,622,089	5,607,612
Investments in mortgage notes receivables		-294,000
Investments in unconsolidated joint ventures			-735,000
Return of capital from unconsolidated joint ventures			8,661,211
Improvements to properties	-26,142,347	-19,066,525	-11,404,098
Deposits on real estate acquisitions	-3,725,100	1,225,000	-2,000,000
Construction escrows and other	594,736	327,943	-244,639
Net cash used in investing activities	-399,855,825	-344,977,110	-261,574,478
CASH FLOWS FROM FINANCING ACTIVITIES
Principal repayment on mortgages	-21,981,922	-14,902,386	-7,874,618
Proceeds from the draw on term loan/credit facility	549,300,000	342,950,000	209,000,000
Payments on credit facility	-449,750,000	-405,000,000
Payments on term loan	-200,000,000
Payment of contingent consideration		-1,864,370
Proceeds from exercise of warrants	70,723,391	226,529,778	12,000
Payments to acquire warrants		-32,785,921
Proceeds from the sale of stock	214,906,251		37,811,658
Purchase of Non-controlling interest		-2,389
Redemption of Operating Partnership Units	-3,280,000	-2,189,779
Distributions to Operating Partnership	-2,008,636	-747,230
Deferred financing and other costs	-3,188,618	-4,097,377	-2,792,050
Registration expenditures	-9,512,944	-69,245	-1,162,787
Dividends paid to common shareholders	-53,574,020	-42,512,597	-27,057,495
Repurchase of common stock	-630,895	-406,542	-708,176
Common shares issued under the 2009 Plan			22
Retirement of options		-274,830
Net cash provided by financing activities	337,502,607	310,452,112	207,228,554
Net increase (decrease) in cash and cash equivalents	2,853,709	3,227,467	-29,625,358
Cash and cash equivalents at beginning of period	7,919,697	4,692,230	34,317,588
Cash and cash equivalents at end of period	10,773,406	7,919,697	4,692,230
Supplemental disclosure of cash activities:
Cash paid on gross receipts and income for federal and state purposes	331,902	241,603	310,406
Interest paid	26,005,827	14,579,450	10,910,587
Other non-cash investing and financing activities b increase (decrease):
Issuance of OP Units in connection with acquisitions of entities	16,342,775	45,372,731
Assumed mortgage at fair value		62,749,675	19,668,352
Intangible lease liabilities	44,287,149	35,039,360	16,280,503
Transfer of equity investment in property to real estate investment		15,990,769	4,008,350
Interest rate swap asset	-1,948,243	1,948,243
Accrued interest rate swap liabilities	-2,528,703	6,733,812	4,156,096
Accrued real estate improvement costs	1,372,626	591,671	837,312
Senior Notes 2023 [Member] | Retail Opportunity Investments Partnership L.P. [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of Notes		245,825,000
Senior Notes 2023 [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of Notes		245,825,000
Senior Notes 2024 [Member] | Retail Opportunity Investments Partnership L.P. [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of Notes	246,500,000
Senior Notes 2024 [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of Notes	246,500,000
Retail Opportunity Investments Partnership L.P. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	21,049,222	33,978,453	7,892,613
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	58,434,981	40,397,895	29,074,709
Amortization of deferred financing costs and mortgage premiums, net	-432,327	-144,313	494,843
Gain on consolidation of joint venture		-20,381,849	-2,144,696
Gain on bargain purchase			-3,864,145
Straight-line rent adjustment	-3,794,936	-3,733,913	-3,040,510
Amortization of above and below market rent	-6,944,572	-4,444,117	-3,659,011
Amortization relating to stock based compensation	3,662,034	2,856,391	3,393,439
Provisions for tenant credit losses	2,315,972	1,621,940	1,160,568
Equity earned in earnings from unconsolidated joint ventures		-2,389,937	-1,697,980
Other noncash interest expense	1,847,640
Gain on sale of real estate	-4,868,553
Loss on sale of discontinued operations		713,529
Settlement of interest rate swap agreements	-3,230,000	-8,750,000
Distribution of cumulative earnings from unconsolidated joint ventures			686,017
Other		792,244
Change in operating assets and liabilities
Restricted cash	190,011	74,083	-225,245
Tenant and other receivables	-1,604,811	-4,820,044	-3,679,442
Prepaid expenses	-1,106,227	-104,814	-573,099
Accounts payable and accrued expenses	-1,164,032	2,942,797	-1,912,490
Other asset and liabilities, net	852,525	-855,880	2,814,995
Net cash provided by operating activities	65,206,927	37,752,465	24,720,566
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in real estate	-398,205,203	-289,399,034	-255,851,952
Acquisition of entities		-43,378,106
Proceeds from sale of real estate	27,622,089	5,607,612
Investments in mortgage notes receivables		-294,000
Investments in unconsolidated joint ventures			-735,000
Return of capital from unconsolidated joint ventures			8,661,211
Improvements to properties	-26,142,347	-19,066,525	-11,404,098
Deposits on real estate acquisitions	-3,725,100	1,225,000	-2,000,000
Construction escrows and other	594,736	327,943	-244,639
Net cash used in investing activities	-399,855,825	-344,977,110	-261,574,478
CASH FLOWS FROM FINANCING ACTIVITIES
Principal repayment on mortgages	-21,981,922	-14,902,386	-7,874,618
Proceeds from the draw on term loan/credit facility	549,300,000	342,950,000	209,000,000
Payments on credit facility	-449,750,000	-405,000,000
Payments on term loan	-200,000,000
Payment of contingent consideration		-1,864,370
Proceeds from exercise of warrants	70,723,391	226,529,778	12,000
Payments to acquire warrants		-32,785,921
Proceeds from the sale of stock	214,906,251		37,811,658
Purchase of Non-controlling interest		-2,389
Redemption of Operating Partnership Units	-3,280,000	-2,189,779
Distributions to Operating Partnership	-2,008,636	-747,230
Deferred financing and other costs	-3,188,618	-4,097,377	-2,792,050
Registration expenditures	-9,512,944	-69,245	-1,162,787
Dividends paid to common shareholders	-53,574,020	-42,512,597	-27,057,495
Repurchase of common stock	-630,895	-406,542	-708,176
Common shares issued under the 2009 Plan			22
Retirement of options		-274,830
Net cash provided by financing activities	337,502,607	310,452,112	207,228,554
Net increase (decrease) in cash and cash equivalents	2,853,709	3,227,467	-29,625,358
Cash and cash equivalents at beginning of period	7,919,697	4,692,230	34,317,588
Cash and cash equivalents at end of period	10,773,406	7,919,697	4,692,230
Supplemental disclosure of cash activities:
Cash paid on gross receipts and income for federal and state purposes	331,902	241,603	310,406
Interest paid	26,005,827	14,579,450	10,910,587
Other non-cash investing and financing activities b increase (decrease):
Issuance of OP Units in connection with acquisitions of entities	16,342,775	45,372,731
Assumed mortgage at fair value		62,749,675	19,668,352
Intangible lease liabilities	44,287,149	35,039,360	16,280,503
Transfer of equity investment in property to real estate investment		15,990,769	4,008,350
Interest rate swap asset	-1,948,243	1,948,243
Accrued interest rate swap liabilities	-2,528,703	6,733,812	4,156,096
Accrued real estate improvement costs	$1,372,626	$591,671	$837,312

Consolidated_Statements_of_Par

Consolidated Statements of Partners' Capital (USD $)		ATM Equity Offering Sales Agreement [Member]		ATM Equity Offering Sales Agreement [Member]	ATM Equity Offering Sales Agreement [Member]	Limited Partnerbs Capital [Member]		Limited Partnerbs Capital [Member]		ROIC Capital [Member]		ROIC Capital [Member]		Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member]	Cash Redemption for Non-controlling Interests [Member]	Cash Redemption for Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]	Officer [Member]	Officer [Member]	Retail Opportunity Investments Partnership L.P. [Member]	Total
		ROIC Capital [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Cash Redemption for Non-controlling Interests [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Officer [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Cash Redemption for Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]	Purchase of Non-controlling Interests [Member]	Retail Opportunity Investments Partnership L.P. [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Retail Opportunity Investments Partnership L.P. [Member]		Retail Opportunity Investments Partnership L.P. [Member]
		Retail Opportunity Investments Partnership L.P. [Member]				Retail Opportunity Investments Partnership L.P. [Member]				Retail Opportunity Investments Partnership L.P. [Member]							Retail Opportunity Investments Partnership L.P. [Member]
Balance at December 31, 2011 at Dec. 31, 2011												$464,581,495	[1]	($14,094,830)					$2,389								$450,489,054
Balance at December 31, 2011 (in Shares) at Dec. 31, 2011	[1]											49,375,738
OP Units issued under the 2009 Plan												22	[1]														22	22
OP Units issued under the 2009 Plan (in Shares)	[1]											224,067
Repurchase of OP Units												-708,176	[1]														-708,176	708,176
Repurchase of OP Units (in Shares)	[1]											-55,496
Stock based compensation expense												3,393,439	[1]														3,393,439	3,393,439
Proceeds from the issuance of OP Units		37,811,658	[1]	37,811,658	-37,811,658
Proceeds from the issuance of OP Units (in Shares)	[1]	3,051,445
Registration expenditures												-1,162,787	[1]														-1,162,787
Issuance of OP Units upon exercise of warrants												12,000	[1]														12,000	12,000
Issuance of OP Units upon exercise of warrants (in Shares)	[1]											1,000
Cash distributions												-27,057,495	[1]														-27,057,495
Dividends payable to officers										-68,475	[1]														-68,475	-68,475		-27,057,495
Net income attributable to Retail Opportunity Investments Partnership, LP												7,892,613	[1]														7,892,613	7,892,613
Other comprehensive gain (loss)														-4,059,782	-4,059,782												-4,059,782	-4,059,782
Balance at Dec. 31, 2012												484,694,294	[1]	-18,154,612					2,389								466,542,071
Balance (in Shares) at Dec. 31, 2012	[1]											52,596,754
Net income attributable to Retail Opportunity Investments Partnership, LP																											2,289,886	2,289,886
Balance at Mar. 31, 2013
Balance at December 31, 2011 at Dec. 31, 2012												484,694,294	[1]	-18,154,612					2,389								466,542,071
Balance at December 31, 2011 (in Shares) at Dec. 31, 2012	[1]											52,596,754
OP Units issued under the 2009 Plan (in Shares)	[1]											313,364
Repurchase of OP Units												-406,542	[1]														-406,542	406,542
Repurchase of OP Units (in Shares)	[1]											-30,333
Retirement of options												-274,830	[1]														-274,830	-274,830
Stock based compensation expense												2,856,391	[1]														2,856,391	2,856,391
Registration expenditures												-69,245	[1]														-69,245
Issuance of OP Units upon exercise of warrants												226,529,778	[1]														226,529,778	226,529,778
Issuance of OP Units upon exercise of warrants (in Shares)	[1]											18,877,482
Issuance of OP Units upon exercise of Sponsor warrants (in Shares)	[1]											688,500
Repurchase of warrants												-32,785,921	[1]														-32,785,921	-32,785,921
Issuance of OP Units in connection with acquisition								45,372,731	[2]																		45,372,731
Issuance of OP Units in connection with acquisition (in Shares)	[2]							3,290,263
Limited Partner distributions								-277,424	[2]											277,424							-277,424	277,424
Decrease in non-controlling interests						-2,189,779	[2]									-2,189,779	-2,389	-2,389			-2,189,779	-2,189,779	-2,389	-2,389
Decrease in non-controlling interests (in Shares)	[2]					-158,221
Adjustment to non-controlling interests								-13,313,937	[2]			13,313,937	[1]							-13,313,937
Cash distributions								-469,806	[2]			-42,468,897	[1]														-42,938,703
Dividends payable to officers										-110,000	[1]									-469,806					-110,000	-110,000		-42,938,703
Net income attributable to Retail Opportunity Investments Partnership, LP								164,892	[2]			33,813,561	[1]														33,978,453	33,978,453
Other comprehensive gain (loss)														9,185,475	9,185,475												9,185,475	9,185,475
Balance at Dec. 31, 2013								29,286,677	[2]			685,092,526	[1]	-8,969,137													705,410,066
Balance (in Shares) at Dec. 31, 2013								3,132,042	[2]			72,445,767	[1]
Balance at December 31, 2011 at Sep. 30, 2013
Net income attributable to Retail Opportunity Investments Partnership, LP																											3,955,264	3,955,264
Balance at Dec. 31, 2013																											705,410,066
Net income attributable to Retail Opportunity Investments Partnership, LP																											3,266,243	3,266,243
Balance at Mar. 31, 2014
Balance at December 31, 2011 at Dec. 31, 2013								29,286,677	[2]			685,092,526	[1]	-8,969,137													705,410,066
Balance at December 31, 2011 (in Shares) at Dec. 31, 2013								3,132,042	[2]			72,445,767	[1]
OP Units issued under the 2009 Plan (in Shares)	[1]											340,621
Repurchase of OP Units												-630,895	[1]														-630,895	630,895
Repurchase of OP Units (in Shares)												-42,438	[1]															0
Cancellation of OP Units (in Shares)	[1]											-5,833
Stock based compensation expense												3,662,034	[1]														3,662,034	3,662,034
Proceeds from the issuance of OP Units												214,906,251	[1]														214,906,251	-214,906,251
Proceeds from the issuance of OP Units (in Shares)					0							14,375,000	[1]
Registration expenditures												-9,633,785	[1]														-9,633,785
Issuance of OP Units upon exercise of warrants												70,538,591	[1]														70,538,591	70,538,591
Issuance of OP Units upon exercise of warrants (in Shares)	[1]											5,878,216
Issuance of OP Units in connection with acquisition								16,342,775	[2]																		16,342,775
Issuance of OP Units in connection with acquisition (in Shares)	[2]							989,272
Decrease in non-controlling interests						-3,280,000	[2]									-3,280,000					-3,280,000	-3,280,000
Decrease in non-controlling interests (in Shares)	[2]					-200,000
Adjustment to non-controlling interests								-2,019,444	[2]			2,019,444	[1]							-2,019,444
Cash distributions								-2,008,636	[2]			-53,522,261	[1]														-55,530,897
Dividends payable to officers										-137,864	[1]									-2,008,636					-137,864	-137,864		-55,530,897
Net income attributable to Retail Opportunity Investments Partnership, LP								748,177	[2]			20,301,045	[1]														21,049,222	21,049,222
Other comprehensive gain (loss)														86,720	86,720												86,720	86,720
Balance at Dec. 31, 2014								39,069,549	[2]			932,595,086	[1]	-8,882,417													962,782,218
Balance (in Shares) at Dec. 31, 2014								3,921,314	[2]			92,991,333	[1]
Balance at December 31, 2011 at Sep. 30, 2014
Net income attributable to Retail Opportunity Investments Partnership, LP																											4,751,521	4,751,521
Balance at Dec. 31, 2014																											$962,782,218
[1]	Consists of general and limited partnership interests held by ROIC.
[2]	Consists of limited partnership interests held by third parties.

Consolidated_Statements_of_Par1

Consolidated Statements of Partners' Capital (Parentheticals) (Accumulated Other Comprehensive Income (Loss) [Member], Retail Opportunity Investments Partnership L.P. [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Cash distributions per unit	$0.64	$0.60	$0.53

Note_1_Organization_Basis_of_P

Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]	1.  Organization, Basis of Presentation and Summary of Significant Accounting Policies
	Business
	Retail Opportunity Investments Corp., a Maryland corporation (“ROIC”), is a fully integrated and self-managed real estate investment trust (“REIT”). ROIC specializes in the acquisition, ownership and management of necessity-based community and neighborhood shopping centers on the west coast of the United States anchored by supermarkets and drugstores.
	ROIC is organized in a traditional umbrella partnership real estate investment trust (“UpREIT”) format pursuant to which Retail Opportunity Investments GP, LLC, its wholly-owned subsidiary, serves as the general partner of, and ROIC conducts substantially all of its business through, its operating partnership subsidiary, Retail Opportunity Investments Partnership, LP, a Delaware limited partnership (the “Operating Partnership”), together with its subsidiaries. Unless otherwise indicated or unless the context requires otherwise, all references to the “Company”, “we,” “us,” “our,” or “our company” refer to ROIC together with its consolidated subsidiaries, including the Operating Partnership.
	With the approval of its stockholders, ROIC reincorporated as a Maryland corporation on June 2, 2011. ROIC began operations as a Delaware corporation, known as NRDC Acquisition Corp., which was incorporated on July 10, 2007, for the purpose of acquiring assets or operating businesses through a merger, capital stock exchange, stock purchase, asset acquisition or other similar business combination with one or more assets or control of one or more operating businesses. On October 20, 2009, ROIC’s stockholders and warrantholders approved each of the proposals presented at the special meetings of stockholders and warrantholders, respectively, in connection with the transactions contemplated by the Framework Agreement (the “Framework Agreement”) ROIC entered into on August 7, 2009 with NRDC Capital Management, LLC, which, among other things, sets forth the steps to be taken by ROIC to continue its business as a corporation that has elected to qualify as a REIT for U.S. federal income tax purposes.
	ROIC’s only material asset is its ownership of direct or indirect partnership interests in the Operating Partnership and membership interest in Retail Opportunity Investments GP, LLC, which is the sole general partner of the Operating Partnership. As a result, ROIC does not conduct business itself, other than acting as the parent company and issuing equity from time to time. The Operating Partnership holds substantially all the assets of the Company and directly or indirectly holds the ownership interests in the Company’s real estate ventures. The Operating Partnership conducts the operations of the Company’s business and is structured as a partnership with no publicly traded equity. Except for net proceeds from warrants exercised and equity issuances by ROIC, which are contributed to the Operating Partnership, the Operating Partnership generates the capital required by the Company’s business through the Operating Partnership’s operations, by the Operating Partnership’s incurrence of indebtedness (directly and through subsidiaries) or through the issuance of operating partnership units (“OP Units”) of the Operating Partnership.
	Recent Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) that raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. This guidance is effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted.  The Company elected to early adopt the provisions of this guidance effective January 1, 2014. The adoption will result in most individual property disposals not qualifying for discontinued operations presentation, and accordingly, the results of the individual property disposals that occurred during 2014 remained in “Income from continuing operations.”
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” The pronouncement was issued to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements for U.S. GAAP and International Financial Reporting Standards. The pronouncement is effective for reporting periods beginning after December 15, 2016. The Company is in the process of evaluating the impact this pronouncement will have on the Company’s consolidated financial statements.
	Principles of Consolidation
	The accompanying consolidated financial statements are prepared on the accrual basis in accordance with GAAP.  The consolidated financial statements include the accounts and those of its subsidiaries, which are wholly-owned or controlled by the Company.  Entities which the Company does not control through its voting interest and entities which are variable interest entities (“VIEs”), but where it is not the primary beneficiary, are accounted for under the equity method.  All significant intercompany balances and transactions have been eliminated.
	The Company follows the FASB guidance for determining whether an entity is a VIE and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE.  Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.
	A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent.  Non-controlling interests are required to be presented as a separate component of equity in the consolidated balance sheet and modifies the presentation of net income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the disclosure of contingent assets and liabilities, the reported amounts of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods covered by the financial statements.  The most significant assumptions and estimates relate to the purchase price allocations, depreciable lives, revenue recognition and the collectability of tenant receivables, other receivables, notes receivables, the valuation of performance-based restricted stock, stock options and derivatives.  Actual results could differ from these estimates.
	Federal Income Taxes
	The Company has elected to qualify as a REIT under Sections 856-860 of the Internal Revenue Code (the “Code”).  Under those sections, a REIT that, among other things, distributes at least 90% of its REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gains) and meets certain other qualifications prescribed by the Code will not be taxed on that portion of its taxable income that is distributed.
	Although it may qualify as a REIT for U.S. federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located.  In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiary (“TRS”), if any, is fully subject to U.S. federal, state and local income taxes. For all periods from inception through September 26, 2013 the Operating Partnership has been an entity disregarded from its sole owner, ROIC, for U.S. federal income tax purposes and as such has not been subject to federal income taxes. Effective September 27, 2013, the Operating Partnership issued 3,290,263 OP Units in connection with the acquisitions of Crossroads Shopping Center and Five Points Plaza, which are described under Note 2 below. Accordingly, the Operating Partnership ceased being a disregarded entity and instead is being treated as a partnership for federal income tax purposes.
	The Company follows the FASB guidance that defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return.  The FASB also provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition.  The Company records interest and penalties relating to unrecognized tax benefits, if any, as interest expense. As of December 31, 2014, the statute of limitations for tax years 2011 through and including 2013 remain open for examination by the Internal Revenue Service (“IRS”) and state taxing authorities.  During the year ended December 31, 2011, the IRS conducted an examination of the Company’s 2009 federal tax return.  During the year ended December 31, 2012 the Company reached a settlement with the IRS in which the Company paid to the IRS approximately $122,000.
	ROIC intends to make regular quarterly distributions to holders of its common stock.  U.S. federal income tax law generally requires that a REIT distribute annually at least 90% of its REIT taxable income, without regard to the deduction for dividends paid and excluding net capital gains, and that it pay U.S. federal income tax at regular corporate rates to the extent that it annually distributes less than 100% of its net taxable income.  ROIC intends to pay regular quarterly dividends to stockholders in an amount not less than its net taxable income, if and to the extent authorized by its board of directors.  Before ROIC pays any dividend, whether for U.S. federal income tax purposes or otherwise, it must first meet both its operating requirements and its debt service on debt.  If ROIC’s cash available for distribution is less than its net taxable income, it could be required to sell assets or borrow funds to make cash distributions or it may make a portion of the required distribution in the form of a taxable stock distribution or distribution of debt securities.
	Real Estate Investments
	All costs related to the improvement or replacement of real estate properties are capitalized.  Additions, renovations and improvements that enhance and/or extend the useful life of a property are also capitalized.  Expenditures for ordinary maintenance, repairs and improvements that do not materially prolong the normal useful life of an asset are charged to operations as incurred.  The Company expenses transaction costs associated with business combinations in the period incurred.  During the years ended December 31, 2014 and 2013, capitalized costs related to the improvements or replacement of real estate properties were approximately $27.5 million and $19.2 million, respectively.
	Upon the acquisition of real estate properties, the fair value of the real estate purchased is allocated to the acquired tangible assets (consisting of land, buildings and improvements), and acquired intangible assets and liabilities (consisting of above-market and below-market leases and acquired in-place leases). Acquired lease intangible assets include above-market leases and acquired in-place leases, and acquired lease intangible liabilities represent below-market leases, in the accompanying consolidated balance sheets. The fair value of the tangible assets of an acquired property is determined by valuing the property as if it were vacant, which value is then allocated to land, buildings and improvements based on management's determination of the relative fair values of these assets. In valuing an acquired property's intangibles, factors considered by management include an estimate of carrying costs during the expected lease-up periods, and estimates of lost rental revenue during the expected lease-up periods based on management’s evaluation of current market demand. Management also estimates costs to execute similar leases, including leasing commissions, tenant improvements, legal and other related costs. Leasing commissions, legal and other related costs (“lease origination costs”) are classified as deferred charges in the accompanying consolidated balance sheets.
	The value of in-place leases is measured by the excess of (i) the purchase price paid for a property after adjusting existing in-place leases to market rental rates, over (ii) the estimated fair value of the property as if vacant. Above-market and below-market lease values are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between the contractual amounts to be received and management's estimate of market lease rates, measured over the terms of the respective leases that management deemed appropriate at the time of acquisition. Such valuations include a consideration of the non-cancellable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below-market rental renewal options are determined based on the Company's experience and the relevant facts and circumstances that existed at the time of the acquisitions. The value of the above-market and below-market leases is amortized to rental income, over the terms of the respective leases including option periods, if applicable. The value of in-place leases are amortized to expense over the remaining non-cancellable terms of the respective leases. If a lease were to be terminated prior to its stated expiration, all unamortized amounts relating to that lease would be recognized in operations at that time. The Company may record a bargain purchase gain if it determines that the purchase price for the acquired assets was less than the fair value. The Company will record a liability in situations where any part of the cash consideration is deferred. The amounts payable in the future are discounted to their present value. The liability is subsequently re-measured to fair value with changes in fair value recognized in the consolidated statements of operations. If, up to one year from the acquisition date, information regarding fair value of assets acquired and liabilities assumed is received and estimates are refined, appropriate property adjustments are made to the purchase price allocation on a retrospective basis.
	In conjunction with the Company’s pursuit and acquisition of real estate investments, the Company expensed acquisition transaction costs during the years ended December 31, 2014, 2013 and 2012 of approximately $1.0 million, $1.7 million and $1.3 million, respectively.
	Regarding certain of the Company’s 2014 and 2013 property acquisitions (see Note 2), the fair value of in-place leases and other intangibles have been allocated to intangible asset and liability accounts.
	Sales of real estate are recognized only when sufficient down payments have been obtained, possession and other attributes of ownership have been transferred to the buyer and the Company has no significant continuing involvement. The application of these criteria can be complex and requires the Company to make assumptions. Management has determined that all of these criteria were met for all real estate sold during the periods presented.
	In June 2014, the Company sold the Phillips Village Shopping Center, a non-core shopping center located in Pomona, California with an occupancy rate of approximately 10.4% as of May 31, 2014. The sales price of this property of approximately $16.0 million, less costs to sell, resulted in net proceeds to the Company of approximately $15.6 million. The Company recorded a gain on sale of property of approximately $3.3 million for the year ended December 31, 2014.
	In August 2014, the Company sold the Oregon City Point Shopping Center, a non-core shopping center located in Oregon City, Oregon. The sales price of this property of approximately $12.4 million, less costs to sell, resulted in net proceeds of approximately $12.0 million. The Company recorded a gain on sale of property of approximately $1.6 million for the year ended December 31, 2014.
	Any reference to square footage or occupancy is unaudited and outside the scope of our independent registered public accounting firm’s audit of the Company’s financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board.
	Asset Impairment
	The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the asset to aggregate future net cash flows (undiscounted and without interest) expected to be generated by the asset. If such assets are considered impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceed the fair value. Management does not believe that the value of any of the Company’s real estate investments was impaired at December 31, 2014.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.  Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the federally insured limit by the Federal Deposit Insurance Corporation.  The Company has not experienced any losses related to these balances.
	Restricted Cash
	The terms of several of the Company’s mortgage loans payable require the Company to deposit certain replacement and other reserves with its lenders.  Such “restricted cash” is generally available only for property-level requirements for which the reserves have been established and is not available to fund other property-level or Company-level obligations.
	Revenue Recognition
	Management has determined that all of the Company’s leases with its various tenants are operating leases.  Rental income is generally recognized based on the terms of leases entered into with tenants.  In those instances in which the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant.  When the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin.  Minimum rental income from leases with scheduled rent increases is recognized on a straight-line basis over the lease term.  Percentage rent is recognized when a specific tenant’s sales breakpoint is achieved.  Property operating expense recoveries from tenants of common area maintenance, real estate taxes and other recoverable costs are recognized in the period the related expenses are incurred.  Lease incentives are amortized as a reduction of rental revenue over the respective tenant lease terms.
	Termination fees (included in rental revenue) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date.  The Company recognizes termination fees in accordance with Securities and Exchange Commission’s guidance when the following conditions are met:  (a) the termination agreement is executed; (b) the termination fee is determinable; (c) all landlord services pursuant to the terminated lease have been rendered; and (d) collectivity of the termination fee is assured.  Interest income is recognized as it is earned.  Gains or losses on disposition of properties are recorded when the criteria for recognizing such gains or losses under generally accepted accounting principles have been met.
	The Company must make estimates as to the collectability of its accounts receivable related to base rent, straight-line rent, expense reimbursements and other revenues.  Management analyzes accounts receivable and the allowance for bad debts by considering tenant creditworthiness, current economic trends, and changes in tenants’ payment patterns when evaluating the adequacy of the allowance for doubtful accounts receivable.  The Company also provides an allowance for future credit losses of the deferred straight-line rents receivable.  The provision for doubtful accounts at December 31, 2014 and December 31, 2013 was approximately $3.6 million and $3.2 million, respectively.
	Depreciation and Amortization
	The Company uses the straight-line method for depreciation and amortization.  Buildings are depreciated over the estimated useful lives which the Company estimates to be 39-40 years.  Property improvements are depreciated over the estimated useful lives that range from 10 to 20 years.  Furniture and fixtures are depreciated over the estimated useful lives that range from 3 to 10 years.  Tenant improvements are amortized over the shorter of the life of the related leases or their useful life.
	Deferred Charges
	Deferred charges consist principally of leasing commissions and acquired lease origination costs (which are amortized ratably over the life of the tenant leases) and financing fees (which are amortized over the term of the related debt obligation).  Deferred charges in the accompanying consolidated balance sheets are shown at cost, net of accumulated amortization of approximately $18.8 million and $14.9 million, as of December 31, 2014 and 2013, respectively.
	The unamortized balances of deferred charges as of December 31, 2014 that will be charged to future operations are as follows:
		Lease Origination			Financing Costs			Total
		Costs
	2015	$	6,655,924		$	1,722,372		$	8,378,296
	2016		5,366,837			1,668,862			7,035,699
	2017		4,212,704			1,627,525			5,840,229
	2018		3,128,972			1,607,781			4,736,753
	2019		2,379,626			576,295			2,955,921
	Thereafter		8,621,371			2,162,704			10,784,075
		$	30,365,434		$	9,365,539		$	39,730,973
	Internal Capitalized Leasing Costs
	The Company capitalizes a portion of payroll-related costs related to its leasing personnel associated with new leases and lease renewals. These costs are amortized over the life of the respective leases. During the years ended December 31, 2014, 2013 and 2012, the Company capitalized approximately $947,000, $742,000 and $695,000, respectively, of such payroll-related costs.
	Concentration of Credit Risk
	Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and tenant receivables.  The Company places its cash and cash equivalents in excess of insured amounts with high quality financial institutions.  The Company performs ongoing credit evaluations of its tenants and requires tenants to provide security deposits.
	Earnings Per Share
	Basic earnings (loss) per share (“EPS”) excludes the impact of dilutive shares and is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding for the period.  Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue shares of common stock were exercised or converted into shares of common stock and then shared in the earnings of the Company.
	During the years ended December 31, 2014, 2013 and 2012, the effect of approximately 41,400,000 warrants to purchase the Company’s common stock  (the “Public Warrants”) issued in connection with the Company’s initial public offering (the “IPO”), and the 8,000,000 warrants (the “Private Placement Warrants”) purchased by NRDC Capital Management, LLC simultaneously with the consummation of the IPO, for the time these were outstanding during these periods, were included in the calculation of diluted EPS since the weighted average share price was greater than the exercise price during these periods.
	For the years ended December 31, 2014, 2013 and 2012, basic EPS was determined by dividing net income allocable to common stockholders for the applicable period by the weighted average number of shares of common stock outstanding during such period. Net income during the applicable period is also allocated to the time-based unvested restricted stock as these grants are entitled to receive dividends and are therefore considered a participating security. Time-based unvested restricted stock is not allocated net losses and/or any excess of dividends declared over net income; such amounts are allocated entirely to the common stockholders other than the holders of time-based unvested restricted stock. The performance-based restricted stock grants awarded under the 2009 Plan described in Note 9 are excluded from the basic EPS calculation, as these units are not participating securities.
	The following table sets forth the reconciliation between basic and diluted EPS for ROIC:
		Year Ended December 31,
	2014			2013			2012
Numerator:
Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
Less income from continuing operations attributable to non-controlling interests		(748,177	)		(164,892	)		—
Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
Income from continuing operations available for common shareholders, basic		20,141,556			34,448,729			7,679,252
Loss from discontinued operations available to common shareholders, basic		—			(713,529	)		—
Net income available to common stockholders, basic	$	20,141,556		$	33,735,200		$	7,679,252
Numerator:
Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
Income from continuing operations available for common shareholders, diluted		20,889,733			34,613,621			7,679,252
Loss from discontinued operations available to common shareholders, diluted		—			(713,529	)		—
Net income available to common stockholders, diluted	$	20,889,733		$	33,900,092		$	7,679,252
Denominator:
Denominator for basic EPS – weighted average common shares		83,411,230			67,419,497			51,059,408
Warrants		631,086			2,568,822			1,165,663
OP Units		3,162,658			838,508			—
Restricted stock awards - performance-based		162,327			113,066			95,466
Stock Options		86,108			64,487			50,631
Denominator for diluted EPS – weighted average common equivalent shares		87,453,409			71,004,380			52,371,168
Earnings Per Unit
The following table sets forth the reconciliation between basic and diluted earnings per unit for the Operating Partnership:
	Year Ended December 31,
	2014			2013			2012
Numerator:
Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
Less earnings allocated to unvested units		(159,489	)		(78,361	)		(213,361	)
Income from continuing operations available for unitholders, basic and diluted		20,889,733			34,613,621			7,679,252
Loss from discontinued operations available to unitholders, basic and diluted		—			(713,529	)		—
Net income available to unitholders, basic and diluted	$	20,889,733		$	33,900,092		$	7,679,252
Denominator:
Denominator for basic EPS – weighted average common units		86,573,888			68,258,005			51,059,408
Warrants		631,086			2,568,822			1,165,663
Restricted stock awards - performance-based		162,327			113,066			95,466
Stock Options		86,108			64,487			50,631
Denominator for diluted EPS – weighted average common equivalent units		87,453,409			71,004,380			52,371,168
Stock-Based Compensation
The Company has a stock-based employee compensation plan, which is more fully described in Note 9.
The Company accounts for its stock-based compensation plans based on the FASB guidance which requires that compensation expense be recognized based on the fair value of the stock awards less estimated forfeitures.  Restricted stock grants vest based upon the completion of a service period (“time-based grants”) and/or the Company meeting certain established financial performance criteria (“performance-based grants”).  Time-based grants are valued according to the market price for the Company’s common stock at the date of grant.  For performance-based grants, a Monte Carlo valuation model is used, taking into account the underlying contingency risks associated with the performance criteria.  It is the Company’s policy to grant options with an exercise price equal to the quoted closing market price of stock on the grant date.  Awards of stock options and time-based grants of stock are expensed as compensation on a straight-line basis over the vesting period.  Awards of performance-based grants are expensed as compensation under an accelerated method and are recognized in income regardless of the results of the performance criteria.
Derivatives
The Company records all derivatives on the balance sheet at fair value.  The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.  Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges.  Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.  Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. When the Company terminates a derivative for which cash flow hedging was being applied, the balance which was recorded in Other Comprehensive Income is amortized to interest expense over the remaining contractual term of the swap. The Company includes cash payments made to terminate interest rate swaps as an operating activity on the statement of cash flows, given the nature of the underlying cash flows that the derivative was hedging.
Segment Reporting
The Company’s primary business is the ownership, management, and redevelopment of retail real estate properties. The Company reviews operating and financing information for each property on an individual basis and therefore, each property represents an individual operating segment. The Company evaluates financial performance using property operating income, defined as operating revenues (base rent and recoveries from tenants), less property and related expenses (property operating expenses and property taxes). The Company has aggregated the properties into one reportable segment as the properties share similar long-term economic characteristics and have other similarities including the fact that they are operated using consistent business strategies, are typically located in major metropolitan areas, and have similar tenant mixes.
Reclassifications
Certain reclassifications have been made to the prior period consolidated financial statements and notes to conform to the current year presentation.

Note_2_Real_Estate_Investments

Note 2 - Real Estate Investments	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	2.  Real Estate Investments
	The following real estate investment transactions occurred during the years ended December 31, 2014 and 2013.
	Property Acquisitions in 2014
	On February 18, 2014, the Company acquired the property known as Tigard Marketplace located in Tigard, Oregon, within the Portland metropolitan area, for a purchase price of approximately $25.1 million. Tigard Marketplace is approximately 137,000 square feet and is anchored by H-Mart Supermarket. The property was acquired with borrowings under the Company’s credit facility.
	On February 28, 2014, the Company acquired the property known as Creekside Plaza located in Poway, California, within the San Diego metropolitan area, for a purchase price of approximately $44.0 million. Creekside Plaza is approximately 129,000 square feet and is anchored by Stater Brothers Supermarket. The property was acquired with borrowings under the Company’s credit facility.
	On April 30, 2014, the Company acquired the property known as North Park Plaza located in San Jose, California, within the San Francisco Bay Area metropolitan area, for a purchase price of approximately $27.8 million. North Park Plaza is approximately 77,000 square feet and is anchored by SF Supermarket. The property was acquired with borrowings under the Company’s credit facility and available cash.
	On May 22, 2014, the Company acquired the property known as Aurora Square II located in Shoreline, Washington, within the Seattle metropolitan area, for a purchase price of approximately $15.8 million. Aurora Square II is approximately 66,000 square feet and is contiguous to an existing ROIC grocery-anchored shopping center, Aurora Square. Aurora Square II, together with Aurora Square, aggregate 104,000 square feet and are anchored by Marshall’s (Aurora Square II) and Central Supermarket (Aurora Square). The property was acquired with borrowings under the Company’s credit facility and available cash.
	On June 13, 2014, the Company acquired the property known as Fallbrook Shopping Center located in West Hills, California, within the Los Angeles metropolitan area, for a purchase price of approximately $210.0 million. Fallbrook Shopping Center has approximately 1.1 million square feet of gross leasable area (“GLA”) of which approximately 756,000 square feet is owned by the Company. Key tenants include Trader Joe’s, Sprouts Market, Home Depot, Kohl’s, TJ Maxx, Ross Dress For Less, AMC Theaters and 24 Hour Fitness. Fallbrook Shopping Center also features Target, Walmart and Kroger (Ralph’s) Supermarket, which occupy substantially all of the GLA not owned by the Company. The property was acquired with borrowings under the Company’s credit facility and available cash.
	On December 3, 2014, the Company acquired the property known as Moorpark Town Center located in Moorpark, California, within the Los Angeles metropolitan area, for a purchase price of approximately $27.3 million. Moorpark Town Center is approximately 134,000 square feet and is anchored by Kroger (Ralph’s) Supermarket and CVS Pharmacy. The property was acquired with borrowings under the Company’s credit facility.
	On December 4, 2014, the Company acquired the property known as Mission Foothill Marketplace located in Mission Viejo, California, within the Orange County metropolitan area, for a purchase price of approximately $29.0 million. Mission Foothill Marketplace is approximately 111,000 square feet and is anchored by Haggen Supermarket and CVS Pharmacy. The property was acquired with borrowings under the Company’s credit facility.
	On December 11, 2014, the Company acquired the property known as Wilsonville Town Center located in Wilsonville, Oregon, within the Portland metropolitan area, for an adjusted purchase price of approximately $35.6 million. Wilsonville Town Center is approximately 168,000 square feet and is anchored by Thriftway Supermarket, Rite Aid Pharmacy and Dollar Tree. The acquisition was funded through approximately $19.4 million in cash and the issuance of 989,272 OP Units with a fair value of approximately $16.3 million.
	Property Acquisitions in 2013
	During the year ended December 31, 2013, the Company acquired 10 properties throughout the west coast with a total of approximately 1.0 million square feet for a net purchase price of approximately $297.6 million
	Acquisitions of Property-Owning Entities in 2013
	On September 27, 2013, the Company acquired the remaining 51% of the partnership interests in the Terranomics Crossroads Associates, LP from its joint venture partner. The purchase of the remaining interest was funded through the issuance of 2,639,632 OP Units with a fair value of approximately $36.4 million and the assumption of a $49.6 million mortgage loan on the property. Prior to the acquisition date, the Company accounted for its 49% interest in the Terranomics Crossroad Associates, LP as an equity method investment. The acquisition-date fair value of the previous equity interest was $36.0 million and is included in the measurement of the consideration transferred. The Company recognized a gain of $20.4 million as a result of remeasuring its prior equity interest in the venture held before the acquisition. The gain is included in the line item Gain on consolidation of joint venture in the consolidated statements of operations and comprehensive income. The primary asset of Terranomics Crossroads Associates is Crossroads Shopping Center located in Bellevue, Washington, within the Seattle metropolitan area. Crossroads Shopping Center is approximately 464,000 square feet and is anchored by Kroger (QFC) Supermarket, Sports Authority and Bed Bath and Beyond.
	On September 27, 2013, the Company acquired 100% of the membership interests in SARM Five Points Plaza, LLC for an adjusted purchase price of approximately $52.6 million. The primary asset of SARM Five Points Plaza, LLC is Five Points Plaza located in Huntington Beach, California. Five Points Plaza is approximately 161,000 square feet and is anchored by Trader Joes, Old Navy and Pier 1. The purchase of the membership interests was funded through approximately $43.6 million in cash using borrowings under the Company’s credit facility (of which approximately $17.2 million was used by the seller to pay off the existing financing) and the issuance of 650,631 OP Units with a fair value of approximately $9.0 million.
	The financial information set forth below summarizes the Company’s preliminary purchase price allocation for the properties acquired during the year ended December 31, 2014 and the final purchase price allocation for the properties acquired during the year ended December 31, 2013.
		December 31,		December 31,
		2014		2013
	ASSETS
	Land	$	98,897,045	$	176,977,162
	Building and improvements		317,400,652		310,098,731
	Cash and cash equivalents		—		552,213
	Acquired lease intangible asset		32,201,585		28,332,445
	Deferred charges		10,335,846		12,041,794
	Tenant receivables and other assets		—		1,132,232
	Assets acquired	$	458,835,128	$	529,134,577
	LIABILITIES
	Acquired lease intangible liability	$	44,287,149	$	35,039,360
	Mortgage notes assumed		—		62,749,675
	Accrued expenses and other liabilities		—		4,282,450
	Liabilities assumed	$	44,287,149	$	102,071,485
	With respect to these acquisitions, the fair value of in-place leases and other intangibles have been allocated to intangible asset and liability accounts. All allocations are preliminary and may be adjusted as final information becomes available.
	Pro Forma Financial Information
	The pro forma financial information set forth below is based upon the Company’s historical consolidated statements of operations for the years ended December 31, 2014 and 2013, adjusted to give effect to these transactions at the beginning of 2013.
	The pro forma financial information is presented for informational purposes only and may not be indicative of what actual results of operations would have been had the transactions occurred at the beginning of each year, nor does it purport to represent the results of future operations.
		Year Ended December 31,
	Statement of operations:	2014		2013
	Revenues	$	171,900,319	$	169,032,796
	Property operating and other expenses		83,532,767		59,987,450
	Depreciation and amortization		64,650,002		64,885,935
	Net income attributable to Retail Opportunity Investments Corp.	$	23,717,550	$	44,159,411
	The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2014 for the properties acquired during the year ended December 31, 2014.
		Year Ended December 31, 2014
	Statement of operations:
	Revenues	$	16,234,264
	Property operating and other expenses		4,643,335
	Depreciation and amortization		7,673,714
	Net income attributable to Retail Opportunity Investments Corp.	$	3,917,215
	The following table summarizes the operating results included in the Company’s historical consolidated statement of operations for the year ended December 31, 2013 for the properties acquired during the year ended December 31, 2013.
		Year Ended December 31, 2013
	Statement of operations:
	Revenues	$	15,813,152
	Property operating and other expenses		6,010,175
	Depreciation and amortization		7,655,138
	Net income attributable to Retail Opportunity Investments Corp.	$	2,147,839
	Property Dispositions
	On June 5, 2014, the Company sold Phillips Village Shopping Center, a non-core shopping center located in Pomona, California with an occupancy rate of approximately 10.4% as of May 31, 2014. The sales price of this property of approximately $16.0 million, less costs to sell, resulted in net proceeds to the Company of approximately $15.6 million. Accordingly, the Company recorded a gain on sale of approximately $3.3 million for the year ended December 31, 2014 related to this property.
	On August 25, 2014, the Company sold the Oregon City Point Shopping Center, a non-core shopping center located in Oregon City, Oregon. The sales price of this property of approximately $12.4 million, less costs to sell, resulted in net proceeds of approximately $12.0 million. Accordingly, the Company recorded a gain on sale of approximately $1.6 million for year ended December 31, 2014 related to this property.
	Unconsolidated Joint Ventures
	At December 31, 2012, investment in and advances to unconsolidated joint venture consisted of a 49% ownership in Terranomics Crossroads Associates, LP of $15.3 million. On September 27, 2013, the Company acquired the remaining interests in Terranomics Crossroads Associates, LP from its joint venture partner. The purchase of its remaining interest was funded through the issuance of 2,639,632 OP Units with a fair value of approximately $36.4 million and the assumption of a $49.6 million mortgage loan on the property. Upon the acquisition of the remaining interest in the property, the Company reclassified approximately $16.0 million from “Investment in and advances to unconsolidated joint ventures” to “Real estate investments” in the accompanying consolidated balance sheets. The acquisition-date fair value of the previous equity interest was $36.0 million and is included in the measurement of the consideration transferred. The Company recognized a gain of $20.4 million as a result of remeasuring its prior equity interest in the venture held before the acquisition. The gain is included in the line item Gain on consolidation of joint venture in the consolidated statements of operations and comprehensive income.
	As of December 31, 2014, the Company has no remaining unconsolidated joint ventures.

Note_3_Acquired_Lease_Intangib

Note 3 - Acquired Lease Intangibles	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block [Abstract]
Intangible Assets Disclosure [Text Block]	3.  Acquired Lease Intangibles
	Intangible assets and liabilities as of December 31, 2014 and 2013 consisted of the following:
		December 31,			December 31,
		2014			2013
	Assets:
	In-place leases	$	78,548,975		$	71,846,161
	Accumulated amortization		(25,482,306	)		(27,413,310	)
	Above-market leases		26,197,169			18,191,431
	Accumulated amortization		(7,831,174	)		(6,736,811	)
	Acquired lease intangible assets, net	$	71,432,664		$	55,887,471
	Liabilities:
	Below-market leases	$	141,552,303		$	104,092,901
	Accumulated amortization		(23,193,642	)		(18,809,019	)
	Acquired lease intangible liabilities, net	$	118,358,661		$	85,283,882
	For the years ended December 31, 2014, 2013 and 2012, the net amortization of acquired lease intangible assets and acquired lease intangible liabilities for above and below market leases was $6.9 million, $4.4 million and $3.7 million, respectively, which amounts are included in base rents in the accompanying consolidated statements of operations and comprehensive income.  For the years ended December 31, 2014, 2013 and 2012, the net amortization of in-place leases was $12.5 million, $10.3 million and $8.1 million, respectively, which amounts are included in depreciation and amortization in the accompanying consolidated statements of operations and comprehensive income.
	The scheduled future amortization of acquired lease intangible assets as of December 31, 2014 is as follows:
	Year ending December 31:
	2015	$	14,563,383
	2016		11,074,212
	2017		8,839,630
	2018		6,450,192
	2019		4,460,270
	Thereafter		26,044,977
	Total future amortization of acquired lease intangible assets	$	71,432,664
	The scheduled future amortization of acquired lease intangible liabilities as of December 31, 2014 is as follows:
	Year ending December 31:
	2015	$	10,630,084
	2016		9,084,320
	2017		8,257,567
	2018		7,623,632
	2019		6,956,023
	Thereafter		75,807,035
	Total future amortization of acquired lease intangible liabilities	$	118,358,661

Note_4_Tenant_Leases

Note 4 - Tenant Leases	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	4.  Tenant Leases
	Space in the Company’s shopping centers is leased to various tenants under operating leases that usually grant tenants renewal options and generally provide for additional rents based on certain operating expenses as well as tenants’ sales volume.
	Future minimum rents to be received under non-cancellable leases as of December 31, 2014 are summarized as follows:
	Year ending December 31:
	2015	$	117,472,132
	2016		106,814,051
	2017		92,470,433
	2018		75,006,572
	2019		59,197,187
	Thereafter		287,159,418
	Total minimum lease payments	$	738,119,793

Note_5_Discontinued_Operations

Note 5 - Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	5. Discontinued Operations
	On June 5, 2013, the Company sold the Nimbus Village Shopping Center, a non-grocery anchored, non-core shopping center located in Rancho Cordova, California. The sales price of this property of approximately $6.3 million, less costs to sell, resulted in proceeds to the Company of approximately $5.6 million. Accordingly, the Company recorded a loss on sale of property of approximately $714,000 for the year ended December 31, 2013, which has been included in discontinued operations. The carrying value of the property as of December 31, 2012 was approximately $6.3 million.

Note_6_Mortgage_Notes_Payable_

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	6.  Mortgage Notes Payable, Credit Facility and Senior Notes
	ROIC does not hold any indebtedness. All debt is held directly or indirectly by the Operating Partnership, however, ROIC has guaranteed the Operating Partnership’s revolving credit facility, carve-out guarantees on property-level debt, the Senior Notes Due 2023 and the Senior Notes Due 2024.
	Mortgage Notes Payable
	The mortgage notes payable collateralized by respective properties and assignment of leases at December 31, 2014 and December 31, 2013, respectively, were as follows:
	Property	Maturity Date		Interest Rate				31-Dec-14				December 31, 2013
	Euclid Plaza	Nov-14			5.23	%		$	—				8,158,676
	Country Club Gate Center	Jan-15			5.04	%			—				12,236,374
	Renaissance Towne Centre	Jun-15			5.13	%			16,204,826				16,489,812
	Crossroads Shopping Center	Sep-15			6.5	%			48,581,419				49,413,976
	Gateway Village III	Jul-16			6.1	%			7,270,256				7,368,521
	Bernardo Heights Plaza	Jul-17			5.7	%			8,581,168				8,748,605
	Santa Teresa Village	Feb-18			6.2	%			10,829,884				11,033,511
								$	91,467,553			$	113,449,475
	Mortgage Premium								2,715,705				5,453,783
	Total mortgage notes payable							$	94,183,258			$	118,903,258
	The combined aggregate principal maturities of mortgage notes payable during the next five years and thereafter are as follows:
		Principal Repayments				Scheduled Amortization				Mortgage Premium				Total
	2015	$	64,051,173			$	1,236,553			$	1,793,132			$	67,080,858
	2016		7,120,172				462,666				515,867				8,098,705
	2017		8,099,320				361,092				380,470				8,840,882
	2018		10,094,220				42,357				26,236				10,162,813
		$	89,364,885			$	2,102,668			$	2,715,705			$	94,183,258
	During the year ended December 31, 2014, the Company repaid the outstanding principal balance on the Euclid Plaza and Country Club Gate mortgage notes payable of $8.0 million and $12.0 million, respectively, without penalty, in accordance with the prepayment provisions of the notes.
	Credit Facility
	The Operating Partnership has a revolving credit facility with several banks. Previously, the credit facility provided for borrowings of up to $350.0 million. Effective December 12, 2014, the Company entered into a fourth amendment to the amended and restated credit agreement pursuant to which the borrowing capacity was increased to $500.0 million. Additionally, the credit facility contains an accordion feature, which allows the Operating Partnership to increase the facility amount up to an aggregate of $1.0 billion, subject to lender consents and other conditions. The maturity date of the credit facility has been extended to January 31, 2019, subject to a further one-year extension option, which may be exercised by the Operating Partnership upon satisfaction of certain conditions.
	The Operating Partnership previously had a term loan agreement with several banks which provided for a loan of $200.0 million. In connection with the fourth amendment to the credit facility, effective December 12, 2014, the term loan agreement was retired.
	The Company obtained investment grade credit ratings from Moody’s Investors Service (Baa2) and Standard & Poor’s Ratings Services (BBB-) during the second quarter of 2013. Borrowings under the credit facility accrue interest on the outstanding principal amount at a rate equal to an applicable rate based on the credit rating level of the Company, plus, as applicable, (i) a LIBOR rate determined by reference to the cost of funds for dollar deposits for the relevant period (the “Eurodollar Rate”), or (ii) a base rate determined by reference to the highest of (a) the federal funds rate plus 0.50%, (b) the rate of interest announced by KeyBank, National Association at its “prime rate,” and (c) the Eurodollar Rate plus 1.00% (the “Base Rate”). Additionally, the Operating Partnership is obligated to pay a facility fee at a rate based on the credit rating level of the Company, currently 0.20%, and a fronting fee at a rate of 0.125% per year with respect to each letter of credit issued under the credit facility. The credit facility contains customary representations, financial and other covenants. The Operating Partnership’s ability to borrow under the credit facility is subject to its compliance with financial covenants and other restrictions on an ongoing basis. The Operating Partnership was in compliance with such covenants at December 31, 2014.
	As of December 31, 2014, $156.5 million was outstanding under the credit facility. The average interest rate on the credit facility during the year ended December 31, 2014 was 1.3%. The Company had $343.5 million available to borrow under the credit facility at December 31, 2014.
	Senior Notes Due 2024
	The carrying value of the Company’s Senior Notes Due 2024 is as follows:
		December 31,				December 31,
		2014				2013
	Principal amount	$	250,000,000			$	—
	Unamortized debt discount		(3,478,886	)			—
	Senior Notes Due 2024:	$	246,521,114			$	—
	On December 3, 2014, the Operating Partnership completed a registered underwritten public offering of $250.0 million aggregate principal amount of 4.000% Senior Notes due 2024 (the “Senior Notes Due 2024”), fully and unconditionally guaranteed by ROIC. The Senior Notes Due 2024 pay interest semi-annually on June 15 and December 15, commencing on June 15, 2015, and mature on December 15, 2024, unless redeemed earlier by the Operating Partnership. The Senior Notes Due 2024 are the Operating Partnership’s senior unsecured obligations that rank equally in right of payment with the Operating Partnership’s other unsecured indebtedness, and effectively junior to (i) all of the indebtedness and other liabilities, whether secured or unsecured, and any preferred equity of the Operating Partnership’s subsidiaries, and (ii) all of the Operating Partnership’s indebtedness that is secured by its assets, to the extent of the value of the collateral securing such indebtedness outstanding. ROIC fully and unconditionally guaranteed the Operating Partnership’s obligations under the Senior Notes Due 2024 on a senior unsecured basis, including the due and punctual payment of principal of, and premium, if any, and interest on, the notes, whether at stated maturity, upon acceleration, notice of redemption or otherwise. The guarantee is a senior unsecured obligation of ROIC and ranks equally in right of payment with all other senior unsecured indebtedness of ROIC. ROIC’s guarantee of the Senior Notes Due 2024 is effectively subordinated in right of payment to all liabilities, whether secured or unsecured, and any preferred equity of its subsidiaries (including the Operating Partnership and any entity ROIC accounts for under the equity method of accounting). The interest expense recognized on the Senior Notes Due 2024 during the year ended December 31, 2014 includes $750,000 and approximately $21,000 for the contractual coupon interest and the accretion of the debt discount, respectively.
	In connection with the Senior Notes Due 2024 offering, the Company incurred approximately $2.2 million of deferred financing costs which are being amortized over the term of the Senior Notes Due 2024.
	Senior Notes Due 2023
	The carrying value of the Company’s Senior Notes Due 2023 is as follows:
		December 31,				December 31,
		2014				2013
	Principal amount	$	250,000,000			$	250,000,000
	Unamortized debt discount		(3,826,073	)			(4,154,680	)
	Senior Notes Due 2023:	$	246,173,927			$	245,845,320
	On December 9, 2013, the Operating Partnership completed a registered underwritten public offering of $250.0 million aggregate principal amount of 5.000% Senior Notes due 2023 (the “Senior Notes Due 2023”), fully and unconditionally guaranteed by ROIC. The Senior Notes Due 2023 pay interest semi-annually on June 15 and December 15, commencing on June 15, 2014, and mature on December 15, 2023, unless redeemed earlier by the Operating Partnership. The Senior Notes Due 2023 are the Operating Partnership’s senior unsecured obligations that rank equally in right of payment with the Operating Partnership’s other unsecured indebtedness, and effectively junior to (i) all of the indebtedness and other liabilities, whether secured or unsecured, and any preferred equity of the Operating Partnership’s subsidiaries, and (ii) all of the Operating Partnership’s indebtedness that is secured by its assets, to the extent of the value of the collateral securing such indebtedness outstanding. ROIC fully and unconditionally guaranteed the Operating Partnership’s obligations under the Senior Notes Due 2023 on a senior unsecured basis, including the due and punctual payment of principal of, and premium, if any, and interest on, the notes, whether at stated maturity, upon acceleration, notice of redemption or otherwise. The guarantee is a senior unsecured obligation of ROIC and will rank equally in right of payment with all other senior unsecured indebtedness of ROIC. ROIC’s guarantee of the Senior Notes Due 2023 is effectively subordinated in right of payment to all liabilities, whether secured or unsecured, and any preferred equity of its subsidiaries (including the Operating Partnership and any entity ROIC accounts for under the equity method of accounting). The interest expense recognized on the Senior Notes Due 2023 during the year ended December 31, 2014 includes approximately $12.4 million and approximately $329,000 for the contractual coupon interest and the accretion of the debt discount, respectively. The interest expense recognized on the Senior Notes Due 2023 during the year ended December 31, 2013 includes approximately $800,000 and $20,000 for the contractual coupon interest and the accretion of the debt discount, respectively.
	In connection with the Senior Notes Due 2023 offering, the Company incurred approximately $2.6 million of deferred financing costs which are being amortized over the term of the Senior Notes Due 2023.

Note_7_Preferred_Stock_of_ROIC

Note 7 - Preferred Stock of ROIC	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]
Preferred Stock [Text Block]	7.  Preferred Stock of ROIC
	The Company is authorized to issue 50,000,000 shares of preferred stock with such designations, voting and other rights and preferences as may be determined from time to time by the board of directors.  As of December 31, 2014 and 2013, there were no shares of preferred stock outstanding.

Note_8_Common_Stock_and_Warran

Note 8 - Common Stock and Warrants of ROIC	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	8.  Common Stock and Warrants of ROIC
	ATM
	During the year ended December 31, 2011, ROIC entered into an ATM Equity OfferingSM Sales Agreement (the “sales agreement”) with Merrill Lynch, Pierce, Fenner & Smith Incorporated to sell shares of ROIC’s common stock par value $0.0001 per share, having aggregate sales proceeds of $50.0 million from time to time, through an “at the market” equity offering program under which Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as sales (agent) and/or principal agent. During the year ended December 31, 2014, ROIC did not sell any shares under the sales agreement. Additionally, the registration statement related to the sales agreement expired, and accordingly, the Company will not issue any additional shares under this program. Through December 31, 2014, ROIC had sold a total of 3,183,245 shares under the sales agreement, which resulted in gross proceeds of approximately $39.3 million and commissions of approximately $687,600 paid to the agent.
	On September 19, 2014, ROIC entered into four separate Sales Agreements (the “2014 sales agreements”) with Jefferies LLC, KeyBanc Capital Markets Inc., MLV & Co. LLC and Raymond James & Associates, Inc. (each individually, an “Agent” and collectively, the “Agents”) pursuant to which ROIC may sell, from time to time, shares of ROIC’s common stock, par value $0.0001 per share, having an aggregate offering price of up to $100.0 million through the Agents either as agents or principals. During the year ended December 31, 2014, ROIC did not sell any shares under the 2014 sales agreements.
	Warrants
	Simultaneously with the consummation of the IPO, NRDC Capital Management, LLC purchased 8,000,000 Private Placement Warrants at a purchase price of $1.00 per warrant.  The Private Placement Warrants were identical to the Public Warrants except that the Private Placement Warrants were exercisable on a cashless basis as long as they were still held by NRDC Capital Management, LLC or its members, members of its members’ immediate family or their controlled affiliates. The purchase price of the Private Placement Warrants approximated the fair value of such warrants at the purchase date.
	On February 4, 2013, NRDC exercised the outstanding 8,000,000 Private Placement Warrants on a cashless basis pursuant to which ROIC issued 688,500 shares to NRDC.
	ROIC had the right to redeem all of the outstanding warrants it issued in the IPO, at a price of $0.01 per warrant upon 30 days’ notice while the warrants were exercisable, only in the event that the last sale price of the common stock is at least a specified price. The terms of the warrants were as follows:
		·	The exercise price of the warrants was $12.00.
		·	The price at which ROIC’s common stock must trade before ROIC was able to redeem the warrants it issued in the IPO was $18.75.
		·	To provide that a warrantholder’s ability to exercise warrants was limited to ensure that such holder’s “Beneficial Ownership” or “Constructive Ownership,” each as defined in ROIC’s charter, did not exceed the restrictions contained in the charter limiting the ownership of shares of ROIC’s common stock.
	ROIC had reserved 53,400,000 shares for the exercise of the Public Warrants and the Private Placement Warrants, and issuance of shares under ROIC’s 2009 Equity Incentive Plan (the “2009 Plan”). During the year ended December 31, 2014, the third-party warrant holders exercised a total of 5,878,216 Public Warrants, resulting in approximately $70.5 million of proceeds. During the year ended December 31, 2013, the third-party warrant holders exercised a total of 18,877,482 Public Warrants, resulting in approximately $226.5 million of proceeds.
	In May 2010, ROIC’s board of directors authorized a warrant repurchase program to repurchase up to a maximum of $40.0 million of ROIC’s warrants. During the year ended December 31, 2013, ROIC repurchased 744,850 warrants under the program in open market transactions for approximately $1.4 million. During the year ended December 31, 2013, ROIC repurchased an additional 15,834,000 warrants in privately negotiated transactions for approximately $31.3 million. No such repurchases occurred during the year ended December 31, 2014.
	On October 23, 2014, ROIC's remaining outstanding warrants expired and 64,452 warrants expired unexercised.
	Stock Repurchase Program
	On July 31, 2013, ROIC’s board of directors authorized a stock repurchase program to repurchase up to a maximum of $50.0 million of the Company’s common stock. During the year ended December 31, 2014, the Company did not repurchase any shares of common stock under this program.
	Equity Issuance
	On June 18, 2014, ROIC issued 14,375,000 shares of common stock in a registered public offering, including shares issued upon the exercise in full of the underwriters’ option to purchase additional shares, resulting in net proceeds of approximately $205.5 million, after deducting the underwriters’ discounts and commissions and offering expenses.

Note_9_Stock_Compensation_and_

Note 9 - Stock Compensation and Other Benefit Plans for ROIC	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	9.  Stock Compensation and Other Benefit Plans for ROIC
	The Company follows the FASB guidance related to stock compensation which establishes financial accounting and reporting standards for stock-based employee compensation plans, including all arrangements by which employees receive shares of stock or other equity instruments of the employer, or the employer incurs liabilities to employees in amounts based on the price of the employer’s stock.  The guidance also defines a fair value-based method of accounting for an employee stock option or similar equity instrument.
	During 2009, the Company adopted the 2009 Plan.  The 2009 Plan provides for grants of restricted common stock and stock option awards up to an aggregate of 7.5% of the issued and outstanding shares of the Company’s common stock at the time of the award, subject to a ceiling of 4,000,000 shares.
	Restricted Stock
	During the year ended December 31, 2014, the Company awarded 320,500 shares of restricted common stock under the 2009 Plan, of which 118,750 shares are performance-based grants and the remainder of the shares are time based grants.  The performance-based grants vest in three equal annual tranches, based on pre-defined market-specific performance criteria with vesting dates on January 1, 2015, 2016 and 2017.
	A summary of the status of the Company’s non-vested restricted stock awards as of December 31, 2014, and changes during the year ended December 31, 2014 are presented below:
		Shares			Weighted Average
					Grant Date Fair Value
	Non-vested at December 31, 2013		440,650		$	11.4
	Granted		320,500		$	13.42
	Vested		(192,459	)	$	12.76
	Forfeited		(9,333	)	$	13.65
	Non-vested at December 31, 2014		559,358		$	11.51
	As of December 31, 2014, there remained a total of $3.4 million of unrecognized restricted stock compensation related to outstanding non-vested restricted stock grants awarded under the 2009 Plan.  Restricted stock compensation is expected to be expensed over a remaining weighted average period of 1.7 years (irrespective of achievement of the performance conditions). The total fair value of restricted stock that vested during the years ended December 31, 2014, 2013 and 2012 was $2.9 million, $2.4 million and $2.5 million, respectively.
	Stock Based Compensation Expense
	For the years ended December 31, 2014, 2013 and 2012, the amounts charged to expense for all stock based compensation totaled approximately $3.7 million, $2.9 million and $3.4 million, respectively.
	Profit Sharing and Savings Plan
	During 2011, the Company established a profit sharing and savings plan (the “401K Plan”), which permits eligible employees to defer a portion of their compensation in accordance with the Code.  Under the 401K Plan, the Company made matching contributions on behalf of eligible employees.  The Company made contributions to the 401K Plan of approximately $25,000, $20,000 and $17,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

Note_10_Capital_of_the_Operati

Note 10 - Capital of the Operating Partnership	12 Months Ended
	Dec. 31, 2014
Partners' Capital Notes [Abstract]
Partners' Capital Notes Disclosure [Text Block]	10. Capital of the Operating Partnership
	As of December 31, 2014, the Operating Partnership had 96,912,647 OP Units outstanding. The Company owned 95.9% of the Operating Partnership at December 31, 2014. As of December 31, 2014, the Company had outstanding 92,991,333 shares of ROIC common stock and 3,921,314 OP Units (excluding OP Units owned by ROIC). A share of ROIC’s common stock and the OP Units have essentially the same economic characteristics as they share equally in the total net income or loss and distributions of the Operating Partnership.
	During the year ended December 31, 2013, in connection with the acquisition of the remaining interests in Crossroads Shopping Center from its joint venture partner, the Company issued a total of 2,639,632 OP Units to limited partners. Additionally, during the year ended December 31, 2013, in connection with the acquisition of the membership interests in SARM Five Points Plaza, LLC, the Company issued a total of 650,631 OP Units to limited partners. On December 11, 2014, in connection with the acquisition of Wilsonville Town Center, the Company issued a total of 989,272 OP Units to limited partners.
	Subject to certain exceptions, holders may redeem their OP Units, at the option of ROIC, for cash or for shares of ROIC common stock on a one-for-one basis. If cash is paid in the redemption, the redemption price is equal to the average closing price on the NASDAQ Stock Market for shares of ROIC’s common stock over the ten consecutive trading days immediately preceding the date a redemption notice is received by ROIC.
	On October 17, 2013, the Company received notices of redemption for 158,221 OP Units. The Company elected to redeem the OP Units in cash, and accordingly, a total of $2.2 million was paid on October 31, 2013 to the holders of the respective OP Units. Further, on November 14, 2014, the Company received notices of redemption for 200,000 OP Units. The Company elected to redeem the OP Units in cash, and accordingly, a total of $3.3 million was paid on December 1, 2014 to the holders of the respective OP Units. In accordance with the Second Amended and Restated Agreement of Limited Partnership of the Operating Partnership, the redemption values were calculated based on the average closing price of the Company’s common stock on the NASDAQ Stock Market for the ten consecutive trading days immediately preceding the date of receipt of the notices of redemption.
	Retail Opportunity Investments GP, LLC, ROIC’s wholly-owned subsidiary, is the sole general partner of the Operating Partnership, and as the parent company, ROIC has the full and complete authority over the Operating Partnership’s day-to-day management and control. As the sole general partner of the Operating Partnership, ROIC effectively controls the ability to issue common stock of ROIC upon redemption of any OP Units. The redemption provisions that permit ROIC to settle in either cash or common stock, at the option of ROIC, are further evaluated in accordance with applicable accounting guidance to determine whether temporary or permanent equity classification on the balance sheet is appropriate. The Company evaluated this guidance, including the requirement to settle in unregistered shares, and determined that the OP Units meet the requirements to qualify for presentation as permanent equity.
	The redemption value of the OP Units owned by the limited partners, not including ROIC, had such units been redeemed at December 31, 2014, was approximately $65.8 million based on the average closing price on the NASDAQ Stock Market of ROIC common stock for the ten consecutive trading days immediately preceding December 31, 2014, which amounted to $16.79 per share.

Note_11_Fair_Value_of_Financia

Note 11 - Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	11.  Fair Value of Financial Instruments
	The Company follows the FASB guidance that defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements.  The guidance applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard does not require any new fair value measurements of reported balances.
	The guidance emphasizes that fair value is a market-based measurement, not an entity-specific measurement.  Therefore, a fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability.  As a basis for considering market participant assumptions in fair value measurements, the guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy).
	Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access.  Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly.  Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals.  Level 3 inputs are unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity.  In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety.  The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability.
	The following disclosures of estimated fair value were determined by management, using available market information and appropriate valuation methodologies as discussed in Note 1.  Considerable judgment is necessary to interpret market data and develop estimated fair value.  Accordingly, the estimates presented herein are not necessarily indicative of the amounts realizable upon disposition of the financial instruments.  The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.
	The carrying values of cash and cash equivalents, restricted cash, tenant and other receivables, deposits, prepaid expenses, other assets, accounts payable and accrued expenses are reasonable estimates of their fair values because of the short-term nature of these instruments. The carrying value of the revolving credit facility is deemed to be at fair value since the outstanding debt is directly tied to monthly LIBOR contracts.  The fair value, based on inputs not quoted on active markets, but corroborated by market data, or Level 2, of the outstanding Senior Notes Due 2023 at December 31, 2014 is approximately $269.7 million. The fair value, based on inputs not quoted on active markets, but corroborated by market data, or Level 2, of the outstanding Senior Notes Due 2024 at December 31, 2014 is approximately $249.4 million. Mortgage notes payable were recorded at their fair value at the time they were assumed and are estimated to have a fair value of approximately $94.7 million with an interest rate range of 2.8% to 3.6% and a weighted average interest rate of 2.9% as of December 31, 2014. These fair value measurements fall within level 3 of the fair value hierarchy.

Note_12_Derivative_and_Hedging

Note 12 - Derivative and Hedging Activities	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	12.  Derivative and Hedging Activities
	During the year ended December 31, 2014, the Company cash settled the remaining outstanding interest rate swaps, and accordingly, none are outstanding as of December 31, 2014. The Company’s objectives in using interest rate derivatives historically were to add stability to interest expense and to manage its exposure to interest rate movements.  To accomplish this objective, the Company used interest rate swaps as part of its interest rate risk management strategy.  Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
	The effective portion of changes in the fair value of derivatives that are designated as cash flow hedges are recorded in AOCI and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings.
	The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of the derivative.  This analysis reflects the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves, and implied volatilities.  The fair value of interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts).  The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.
	The Company incorporated credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements.  In adjusting the fair value of its derivative contract for the effect of non-performance risk, the Company considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.
	Although the Company had determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties.  However, as of December 31, 2013 the Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative position and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives.  As a result, the Company determined that its derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy.
	The table below presents the Company’s liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall.
		Quoted Prices				Significant				Significant			Total
		in Active				Other				Unobservable
		Markets for				Observable				Inputs (Level 3)
		Identical Assets				Inputs (Level 2)
		and Liabilities
		(Level 1)
	December 31, 2013:
	Assets
	Derivative financial instruments	$	—			$	1,948,243			$	—		$	1,948,243
	Liabilities
	Derivative financial instruments	$	—			$	(2,528,703	)		$	—		$	(2,528,703	)
	Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest expense is recognized on the hedged debt. During the next twelve months, the Company estimates that $2.1 million will be reclassified as an increase to interest expense.
	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the balance sheet as of December 31, 2014 and 2013, respectively:
	Derivatives designed as hedging instruments	Balance sheet		31-Dec-14				December 31, 2013
		location		Fair Value				Fair Value
	Interest rate products	Other assets		$	—			$	1,948,243
	Interest rate products	Other liabilities		$	—			$	(2,528,703	)
	Derivatives in Cash Flow Hedging Relationships
	The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the years ended December 31, 2014, 2013, and 2012 respectively.    Amounts reclassified from other comprehensive income (“OCI”) due to ineffectiveness are recognized as interest expense.
		Year Ended December 31, 2014				Year Ended December 31, 2013				Year Ended December 31, 2012
	Amount of (loss) gain recognized in OCI on derivative	$	(3,131,969	)		$	4,564,248			$	(7,859,264	)
	Amount of  loss reclassified from accumulated OCI into interest	$	3,218,689			$	4,621,227			$	3,799,482
	Amount of gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	$	112			$	3,172			$	(7,534	)

Note_13_Commitments_and_Contin

Note 13 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	13.  Commitments and Contingencies
	In the normal course of business, from time to time, the Company is involved in legal actions relating to the ownership and operations of its properties.  In management’s opinion, the liabilities, if any, that ultimately may result from such legal actions are not expected to have a material adverse effect on the consolidated financial position, results of operations or liquidity of the Company.
	The Company has signed several ground leases for certain properties. For financial reporting purposes, rent expense is recognized on a straight-line basis over the term of the lease. Accordingly, rent expense recognized in excess of rent paid is reflected as a liability in the accompanying consolidated balance sheets. Rent expense, for both ground leases and corporate office space, was approximately $1.2 million, $1.1 million, and $780,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	The following table represents the Company’s future minimum annual lease payments under operating leases as of December 31, 2014:
		Operating
		Leases
	2015	$	910,164
	2016		980,650
	2017		1,048,825
	2018		1,053,877
	2019		1,058,807
	Thereafter		37,271,404
	Total minimum lease payments	$	42,323,727
	Tax Protection Agreements
	In connection with the acquisition of the remaining 51% of the partnership interests in the Terranomics Crossroads Associates, LP and the acquisition of 100% of the equity interest in SARM Five Points Plaza LLC in 2013 and the acquisition of Wilsonville Town Center in 2014 (all more fully discussed in Footnote 2), the Company entered into Tax Protection Agreements with certain limited partners of the Operating Partnership. The Tax Protection Agreements require the Company, subject to certain exceptions, to indemnify the respective Sellers receiving OP Units against certain tax liabilities incurred by them, as calculated pursuant to the respective Tax Protection Agreements. If the Company were to trigger the tax protection provisions under these agreements, the Company would be required to pay damages in the amount of the taxes owed by these limited partners (plus additional damages in the amount of the taxes incurred as a result of such payment). The Tax Protection periods for Terranomics Crossroads Associates, LP and SARM Five Points Plaza LLC, and Wilsonville, were provided for twelve and ten years, respectively.

Note_14_Related_Party_Transact

Note 14 - Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	14.  Related Party Transactions
	The Company has entered into several lease agreements with an officer of the Company, whereby pursuant to the lease agreements, the Company is provided the use of storage space.  For the years ended December 31, 2014, 2013 and 2012, the Company incurred approximately $37,000, $25,000 and $9,500, respectively, of expenses relating to the agreements which were included in general and administrative expenses in the accompanying consolidated statements of operations and other comprehensive income.

Note_15_Quarterly_Results_of_O

Note 15 - Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	15.  Quarterly Results of Operations (Unaudited)
	The unaudited quarterly results of operations for the years ended December 31, 2014 and 2013 for ROIC are as follows:
		Year Ended December 31, 2014
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	36,350,136	$	36,914,834	$	40,855,871	$	41,742,670
	Net income	$	3,266,243	$	6,050,762	$	6,980,696	$	4,751,521
	Net income attributable to ROIC	$	3,131,685	$	5,833,750	$	6,748,847	$	4,586,763
	Basic income per share	$	0.04	$	0.08	$	0.07	$	0.05
	Diluted income per share	$	0.04	$	0.07	$	0.07	$	0.05
		Year Ended December 31, 2013
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	24,384,449	$	26,063,466	$	27,147,631	$	33,636,485
	Net income	$	2,289,886	$	2,471,012	$	25,262,291	$	3,955,264
	Net income attributable to ROIC	$	2,289,886	$	2,471,012	$	25,262,291	$	3,790,372
	Basic income per share	$	0.04	$	0.04	$	0.35	$	0.05
	Diluted income per share	$	0.04	$	0.03	$	0.34	$	0.05
	The unaudited quarterly results of operations for the years ended December 31, 2014 and 2013 for the Operating Partnership are as follows:
		Year Ended December 31, 2014
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	36,350,136	$	36,914,834	$	40,855,871	$	41,742,670
	Net income attributable to the Operating Partnership	$	3,266,243	$	6,050,762	$	6,980,696	$	4,751,521
	Basic income per unit	$	0.04	$	0.07	$	0.07	$	0.05
	Diluted income per unit	$	0.04	$	0.07	$	0.07	$	0.05
		Year Ended December 31, 2013
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	24,384,449	$	26,063,466	$	27,147,631	$	33,636,485
	Net income attributable to the Operating Partnership	$	2,289,886	$	2,471,012	$	25,262,291	$	3,955,264
	Basic income per unit	$	0.04	$	0.04	$	0.35	$	0.05
	Diluted income per unit	$	0.04	$	0.03	$	0.34	$	0.05

Note_16_Subsequent_Events

Note 16 - Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	16.  Subsequent Events
	On January 6, 2015, the Company acquired the property known as Ontario Plaza located in Ontario, California, for a purchase price of approximately $31.0 million. Ontario Plaza is approximately 150,000 square feet and is anchored by El Super Supermarket and Rite Aid Pharmacy. The property was acquired with borrowings under the Company’s credit facility.
	On January 6, 2015, the Company acquired the property known as Park Oaks Shopping Center located in Thousand Oaks, California, for a purchase price of approximately $47.7 million. Park Oaks Shopping Center is approximately 110,000 square feet and is anchored by Safeway (Vons) Supermarket. The property was acquired with borrowings under the Company’s credit facility.
	On January 7, 2015, the Company acquired the property known as Winston Manor Shopping Center located in South San Francisco, California, for a purchase price of approximately $20.5 million. Winston Manor Shopping Center is approximately 50,000 square feet and is anchored by Grocery Outlet Supermarket. The property was acquired with borrowings under the Company’s credit facility.
	The purchase price allocations have not been finalized and are expected to be completed during the first quarter of 2015.
	On February 24, 2015, the Company’s board of directors declared a cash dividend on its common stock of $0.17 per share, payable on March 30, 2015 to holders of record on March 16, 2015.
	Subsequent to December 31, 2014, the Company sold 247,722 shares under the 2014 sales agreement, which resulted in gross proceeds of approximately $4.5 million and commissions of approximately $67,000 paid to the agent.

Schedule_III_Real_Estate_and_A

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block]							Initial Cost to Company					Cost Capitalized Subsequent to Acquisition					Amount at Which Carried at Close of Period
										Building &					Building &				Building &				Accumulated		Date of
		Description and Location		Encumbrances			Land			Improvements		Land			Improvements		Land		Improvements		Total (a)		Depreciation (b)(1)		Acquisition
		Paramount Plaza, CA		$	—		$	6,346,871		$	10,274,425	$	94,202		$	1,300,527	$	6,441,073	$	11,574,952		18,016,025	$	1,636,418	12/22/09
		Santa Ana Downtown Plaza, CA			—			7,895,272			9,890,440		—			1,013,833		7,895,272		10,904,273		18,799,545		1,623,119	1/26/10
		Meridian Valley Plaza, WA			—			1,880,637			4,794,789		—			304,352		1,880,637		5,099,141		6,979,778		857,027	2/1/10
		The Market at Lake Stevens, WA			—			3,086,933			12,397,178		—			28,045		3,086,933		12,425,223		15,512,156		1,828,016	3/16/10
		Norwood Shopping Center, CA			—			3,031,309			11,534,239		—			616,789		3,031,309		12,151,028		15,182,337		1,750,339	4/5/10
		Pleasant Hill Marketplace, CA			—			6,359,471			6,927,347		—			741,054		6,359,471		7,668,401		14,027,872		1,251,013	4/8/10
		Vancouver Market Center, WA			—			4,080,212			6,912,155		—			417,874		4,080,212		7,330,029		11,410,241		932,838	6/17/10
		Happy Valley Town Center, OR			—			11,678,257			27,011,054		—			1,658,102		11,678,257		28,669,156		40,347,413		4,084,559	7/14/10
		Cascade Summit, OR			—			8,852,543			7,731,944		—			317,464		8,852,543		8,049,408		16,901,951		1,298,293	8/20/10
		Heritage Market Center, WA			—			6,594,766			17,399,233		—			450,562		6,594,766		17,849,795		24,444,561		2,345,418	9/23/10
		Claremont Center, CA (2)			—			5,975,391			1,018,505		183,362			4,262,940		6,158,753		5,281,445		11,440,198		1,151,120	9/23/10
		Shops At Sycamore Creek, CA			—			3,747,011			11,583,858		—			818,932		3,747,011		12,402,790		16,149,801		2,061,442	9/30/10
		Gateway Village, CA			7,270,256			5,916,530			27,298,339		—			63,677		5,916,530		27,362,016		33,278,546		3,220,700	12/16/10
		Division Crossing, OR			—			3,705,536			8,327,097		—			5,582,839		3,705,536		13,909,936		17,615,472		1,300,209	12/22/10
		Halsey Crossing, OR (2)			—			—			7,773,472		—			533,823		—		8,307,295		8,307,295		1,086,018	12/22/10
		Marketplace Del Rio,CA			—			13,420,202			22,251,180		—			1,180,925		13,420,202		23,432,105		36,852,307		3,187,779	1/3/11
		Pinole Vista, CA			—			9,233,728			17,553,082		—			1,935,156		9,233,728		19,488,238		28,721,966		2,694,503	1/6/11
		Desert Spring Marketplace, CA			—			8,517,225			18,761,350		(159,973	)		1,368,969		8,357,252		20,130,319		28,487,571		2,570,171	2/17/11
		Mills Shopping Center, CA			—			4,083,583			16,833,059		—			4,483,090		4,083,583		21,316,149		25,399,732		2,820,007	2/17/11
		Morada Ranch, CA			—			2,503,605			19,546,783		—			344,846		2,503,605		19,891,629		22,395,234		2,344,922	5/20/11
		Renaissance, CA			16,204,826			8,640,261			13,848,388		—			453,255		8,640,261		14,301,643		22,941,904		1,538,941	8/3/11
		Country Club Gate, CA			—			6,487,457			17,340,757		—			761,367		6,487,457		18,102,124		24,589,581		2,057,986	7/8/11
		Canyon Park, WA			—			9,352,244			11,291,210		—			1,317,512		9,352,244		12,608,722		21,960,966		1,829,222	7/29/11
		Hawks Prairie, WA			—			5,334,044			20,693,920		—			418,156		5,334,044		21,112,076		26,446,120		2,344,695	9/8/11
		Kress Building, WA			—			5,692,748			20,866,133		—			4,411,012		5,692,748		25,277,145		30,969,893		2,427,821	9/30/11
		Round Hill Square, CA			—			6,358,426			17,734,397		—			784,336		6,358,426		18,518,733		24,877,159		2,003,528	8/23/11
		Hillsboro, OR  (2)			—			—			18,054,929		—			524,993		—		18,579,922		18,579,922		1,826,652	11/23/11
		Gateway Shopping Center, WA (2)			—			6,241,688			23,461,824		—			36,902		6,241,688		23,498,726		29,740,414		2,027,163	2/16/12
		Euclid Plaza, CA			—			7,407,116			7,752,767		—			2,718,623		7,407,116		10,471,390		17,878,506		1,052,527	3/28/12
		Green Valley, CA			—			1,684,718			8,999,134		—			259,758		1,684,718		9,258,892		10,943,610		920,097	4/2/12
		Aurora Square, WA			—			3,002,147			1,692,681		—			—		3,002,147		1,692,681		4,694,828		286,108	5/3/12
		Marlin Cove, CA			—			8,814,850			6,797,289		—			1,353,773		8,814,850		8,151,062		16,965,912		776,448	5/4/12
		Seabridge, CA			—			5,098,187			17,164,319		—			540,926		5,098,187		17,705,245		22,803,432		1,581,515	5/31/12
		Novato, CA			—			5,329,472			4,411,801		—			629,040		5,329,472		5,040,841		10,370,313		364,275	7/24/12
		Glendora, CA			—			5,847,407			8,758,338		—			157,145		5,847,407		8,915,483		14,762,890		808,081	8/1/12
		Wilsonville, WA			—			4,180,768			15,394,342		—			230,572		4,180,768		15,624,914		19,805,682		1,183,988	8/1/12
		Bay Plaza, CA			—			5,454,140			14,857,031		—			1,023,146		5,454,140		15,880,177		21,334,317		1,182,562	10/5/12
		Santa Theresa, CA			10,829,884			14,964,975			17,162,039		—			2,031,796		14,964,975		19,193,835		34,158,810		1,453,022	11/8/12
		Cypress West, CA			—			15,479,535			11,819,089		—			1,924,075		15,479,535		13,743,164		29,222,699		938,737	12/7/12
		Redondo Beach, CA			—			16,241,947			13,624,837		—			84,973		16,241,947		13,709,810		29,951,757		956,869	12/28/12
		Harbor Place, CA			—			16,506,423			10,527,092		—			333,180		16,506,423		10,860,272		27,366,695		645,918	12/28/12
		Diamond Bar Town Center, CA			—			9,540,204			16,794,637		—			3,976,039		9,540,204		20,770,676		30,310,880		1,159,965	2/1/13
		Bernardo Heights, CA			8,581,168			3,191,950			8,939,685		—			51,868		3,191,950		8,991,553		12,183,503		531,355	2/6/13
		Canyon Crossing, WA			—			7,940,521			24,659,249		—			2,311,882		7,940,521		26,971,131		34,911,652		1,495,164	4/15/13
		Diamond Hills, CA			—			15,457,603			29,352,602		—			360,963		15,457,603		29,713,565		45,171,168		1,707,176	4/22/13
		Granada Shopping Center, CA			—			3,673,036			13,459,155		—			62,418		3,673,036		13,521,573		17,194,609		760,336	6/27/13
		Hawthorne Crossings, CA			—			10,382,740			29,277,254		—			270,950		10,382,740		29,548,204		39,930,944		1,426,033	6/27/13
		Robinwood, CA			—			3,996,984			11,317,359		—			273,267		3,996,984		11,590,626		15,587,610		520,197	8/23/13
		Five Points Plaza, CA			—			18,419,733			36,965,189		—			339,524		18,419,733		37,304,713		55,724,446		1,346,888	9/27/13
		Crossroads Shopping Center, CA			48,581,419			68,366,245			67,755,526		—			1,636,435		68,366,245		69,391,961		137,758,206		3,100,476	9/27/13
		Peninsula Marketplace, CA			—			14,730,088			19,213,763		—			232,920		14,730,088		19,446,683		34,176,771		770,754	11/1/13
		Country Club Village, CA			—			9,985,749			26,578,916		—			1,270,337		9,985,749		27,849,253		37,835,002		1,065,833	11/26/13
		Plaza de la Canada, CA			—			10,351,028			24,819,026		—			331,346		10,351,028		25,150,372		35,501,400		798,279	12/13/13
		Tigard Marketplace, CA			—			13,586,729			9,603,492		—			257,816		13,586,729		9,861,308		23,448,037		386,341	2/18/14
		Creekside Plaza, CA			—			14,806,966			29,475,850		—			8,024		14,806,966		29,483,874		44,290,840		918,875	2/28/14
		North Park Plaza, CA			—			13,592,522			17,733,266		—			—		13,592,522		17,733,266		31,325,788		355,356	4/30/14
		Aurora Square II, WA			—			6,861,740			9,797,749		—			4,113		6,861,740		9,801,862		16,663,602		249,028	5/22/14
		Fallbrook Shopping Center (2)			—			21,232,016			186,197,471		—			2,409,052		21,232,016		188,606,523		209,838,539		3,200,972	6/13/14
		Moorpark Town Center, CA			—			7,062,639			19,693,955		—			—		7,062,639		19,693,955		26,756,594		44,277	12/3/14
		Mission Foothill Marketplace, CA			—			11,414,592			17,782,506		—			—		11,414,592		17,782,506		29,197,098		38,956	12/4/14
		Wilsonville Town Center, OR			—			10,339,839			27,116,367		—			—		10,339,839		27,116,367		37,456,206		47,007	12/11/14
			$	91,467,553		$	549,960,559		$	1,174,604,863	$	117,591		$	61,215,293	$	550,078,150	$	1,235,820,156	$	1,785,898,306	$	88,173,334
(a) RECONCILIATION OF REAL ESTATE – OWNED SUBJECT TO OPERATING LEASES
		Year Ended December 31,
		2014			2013			2012
Balance at beginning of period:		$	1,372,433,648		$	871,693,595		$	580,832,410
Property improvements during the year			27,514,974			19,513,924			12,264,027
Properties acquired during the year			416,297,696			487,309,488			278,597,158
Properties sold during the year			(23,675,678	)		(6,083,359	)		—
Assets written off during the year			(6,672,334	)		—			—
Balance at end of period:		$	1,785,898,306		$	1,372,433,648		$	871,693,595
(b) RECONCILIATION OF ACCUMULATED DEPRECIATION
		Year Ended December 31,
		2014			2013			2012
Balance at beginning of period:		$	57,499,980		$	32,364,772		$	14,451,032
Depreciation expenses			38,890,425			25,653,359			17,913,740
Properties sold during the year			(2,081,460	)		(433,342	)		—
Property assets fully depreciated and written off			(6,135,611	)		(84,809	)		—
Balance at end of period:		$	88,173,334		$	57,499,980		$	32,364,772
	(1)	Depreciation and investments in building and improvements reflected in the consolidated statement of operations is calculated over the estimated useful life of the assets as follows:
Building:  39-40 years
Property Improvements:  10-20 years
	-2	Property is subject to a ground lease.
	-3	The aggregate cost for Federal Income Tax Purposes for real estate was approximately $1.7 billion at December 31, 2014.

Schedule_IV_Mortgage_Loans_on_

Schedule IV - Mortgage Loans on Real Estate	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans on Real Estate, by Loan Disclosure [Text Block]	SCHEDULE IV – MORTGAGE LOANS ON REAL ESTATE
	31-Dec-14
	The Company has no remaining mortgage loans on real estate as of December 31, 2014.
	(a) RECONCILIATION OF MORTGAGE LOANS ON REAL ESTATE
		Year Ended December 31,
		2014		2013			2012
	Balance at beginning of period:	$	—	$	10,000,000		$	10,000,000
	Mortgage loans eliminated upon consolidation of joint venture		—		(10,000,000	)		—
	Balance at end of period:	$	—	$	—		$	10,000,000

Accounting_Policies_by_Policy_

Accounting Policies, by Policy (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standards Update (“ASU”) that raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. This guidance is effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted.  The Company elected to early adopt the provisions of this guidance effective January 1, 2014. The adoption will result in most individual property disposals not qualifying for discontinued operations presentation, and accordingly, the results of the individual property disposals that occurred during 2014 remained in “Income from continuing operations.”
	In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers.” The pronouncement was issued to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements for U.S. GAAP and International Financial Reporting Standards. The pronouncement is effective for reporting periods beginning after December 15, 2016. The Company is in the process of evaluating the impact this pronouncement will have on the Company’s consolidated financial statements.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation
	The accompanying consolidated financial statements are prepared on the accrual basis in accordance with GAAP.  The consolidated financial statements include the accounts and those of its subsidiaries, which are wholly-owned or controlled by the Company.  Entities which the Company does not control through its voting interest and entities which are variable interest entities (“VIEs”), but where it is not the primary beneficiary, are accounted for under the equity method.  All significant intercompany balances and transactions have been eliminated.
	The Company follows the FASB guidance for determining whether an entity is a VIE and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE.  Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE.
	A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent.  Non-controlling interests are required to be presented as a separate component of equity in the consolidated balance sheet and modifies the presentation of net income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the disclosure of contingent assets and liabilities, the reported amounts of assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the periods covered by the financial statements.  The most significant assumptions and estimates relate to the purchase price allocations, depreciable lives, revenue recognition and the collectability of tenant receivables, other receivables, notes receivables, the valuation of performance-based restricted stock, stock options and derivatives.  Actual results could differ from these estimates.
Income Tax, Policy [Policy Text Block]	Federal Income Taxes
	The Company has elected to qualify as a REIT under Sections 856-860 of the Internal Revenue Code (the “Code”).  Under those sections, a REIT that, among other things, distributes at least 90% of its REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gains) and meets certain other qualifications prescribed by the Code will not be taxed on that portion of its taxable income that is distributed.
	Although it may qualify as a REIT for U.S. federal income tax purposes, the Company is subject to state income or franchise taxes in certain states in which some of its properties are located.  In addition, taxable income from non-REIT activities managed through the Company’s taxable REIT subsidiary (“TRS”), if any, is fully subject to U.S. federal, state and local income taxes. For all periods from inception through September 26, 2013 the Operating Partnership has been an entity disregarded from its sole owner, ROIC, for U.S. federal income tax purposes and as such has not been subject to federal income taxes. Effective September 27, 2013, the Operating Partnership issued 3,290,263 OP Units in connection with the acquisitions of Crossroads Shopping Center and Five Points Plaza, which are described under Note 2 below. Accordingly, the Operating Partnership ceased being a disregarded entity and instead is being treated as a partnership for federal income tax purposes.
	The Company follows the FASB guidance that defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return.  The FASB also provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition.  The Company records interest and penalties relating to unrecognized tax benefits, if any, as interest expense. As of December 31, 2014, the statute of limitations for tax years 2011 through and including 2013 remain open for examination by the Internal Revenue Service (“IRS”) and state taxing authorities.  During the year ended December 31, 2011, the IRS conducted an examination of the Company’s 2009 federal tax return.  During the year ended December 31, 2012 the Company reached a settlement with the IRS in which the Company paid to the IRS approximately $122,000.
	ROIC intends to make regular quarterly distributions to holders of its common stock.  U.S. federal income tax law generally requires that a REIT distribute annually at least 90% of its REIT taxable income, without regard to the deduction for dividends paid and excluding net capital gains, and that it pay U.S. federal income tax at regular corporate rates to the extent that it annually distributes less than 100% of its net taxable income.  ROIC intends to pay regular quarterly dividends to stockholders in an amount not less than its net taxable income, if and to the extent authorized by its board of directors.  Before ROIC pays any dividend, whether for U.S. federal income tax purposes or otherwise, it must first meet both its operating requirements and its debt service on debt.  If ROIC’s cash available for distribution is less than its net taxable income, it could be required to sell assets or borrow funds to make cash distributions or it may make a portion of the required distribution in the form of a taxable stock distribution or distribution of debt securities.
Real Estate, Policy [Policy Text Block]	Real Estate Investments
	All costs related to the improvement or replacement of real estate properties are capitalized.  Additions, renovations and improvements that enhance and/or extend the useful life of a property are also capitalized.  Expenditures for ordinary maintenance, repairs and improvements that do not materially prolong the normal useful life of an asset are charged to operations as incurred.  The Company expenses transaction costs associated with business combinations in the period incurred.  During the years ended December 31, 2014 and 2013, capitalized costs related to the improvements or replacement of real estate properties were approximately $27.5 million and $19.2 million, respectively.
	Upon the acquisition of real estate properties, the fair value of the real estate purchased is allocated to the acquired tangible assets (consisting of land, buildings and improvements), and acquired intangible assets and liabilities (consisting of above-market and below-market leases and acquired in-place leases). Acquired lease intangible assets include above-market leases and acquired in-place leases, and acquired lease intangible liabilities represent below-market leases, in the accompanying consolidated balance sheets. The fair value of the tangible assets of an acquired property is determined by valuing the property as if it were vacant, which value is then allocated to land, buildings and improvements based on management's determination of the relative fair values of these assets. In valuing an acquired property's intangibles, factors considered by management include an estimate of carrying costs during the expected lease-up periods, and estimates of lost rental revenue during the expected lease-up periods based on management’s evaluation of current market demand. Management also estimates costs to execute similar leases, including leasing commissions, tenant improvements, legal and other related costs. Leasing commissions, legal and other related costs (“lease origination costs”) are classified as deferred charges in the accompanying consolidated balance sheets.
	The value of in-place leases is measured by the excess of (i) the purchase price paid for a property after adjusting existing in-place leases to market rental rates, over (ii) the estimated fair value of the property as if vacant. Above-market and below-market lease values are recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between the contractual amounts to be received and management's estimate of market lease rates, measured over the terms of the respective leases that management deemed appropriate at the time of acquisition. Such valuations include a consideration of the non-cancellable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below-market rental renewal options are determined based on the Company's experience and the relevant facts and circumstances that existed at the time of the acquisitions. The value of the above-market and below-market leases is amortized to rental income, over the terms of the respective leases including option periods, if applicable. The value of in-place leases are amortized to expense over the remaining non-cancellable terms of the respective leases. If a lease were to be terminated prior to its stated expiration, all unamortized amounts relating to that lease would be recognized in operations at that time. The Company may record a bargain purchase gain if it determines that the purchase price for the acquired assets was less than the fair value. The Company will record a liability in situations where any part of the cash consideration is deferred. The amounts payable in the future are discounted to their present value. The liability is subsequently re-measured to fair value with changes in fair value recognized in the consolidated statements of operations. If, up to one year from the acquisition date, information regarding fair value of assets acquired and liabilities assumed is received and estimates are refined, appropriate property adjustments are made to the purchase price allocation on a retrospective basis.
	In conjunction with the Company’s pursuit and acquisition of real estate investments, the Company expensed acquisition transaction costs during the years ended December 31, 2014, 2013 and 2012 of approximately $1.0 million, $1.7 million and $1.3 million, respectively.
	Regarding certain of the Company’s 2014 and 2013 property acquisitions (see Note 2), the fair value of in-place leases and other intangibles have been allocated to intangible asset and liability accounts.
	Sales of real estate are recognized only when sufficient down payments have been obtained, possession and other attributes of ownership have been transferred to the buyer and the Company has no significant continuing involvement. The application of these criteria can be complex and requires the Company to make assumptions. Management has determined that all of these criteria were met for all real estate sold during the periods presented.
	In June 2014, the Company sold the Phillips Village Shopping Center, a non-core shopping center located in Pomona, California with an occupancy rate of approximately 10.4% as of May 31, 2014. The sales price of this property of approximately $16.0 million, less costs to sell, resulted in net proceeds to the Company of approximately $15.6 million. The Company recorded a gain on sale of property of approximately $3.3 million for the year ended December 31, 2014.
	In August 2014, the Company sold the Oregon City Point Shopping Center, a non-core shopping center located in Oregon City, Oregon. The sales price of this property of approximately $12.4 million, less costs to sell, resulted in net proceeds of approximately $12.0 million. The Company recorded a gain on sale of property of approximately $1.6 million for the year ended December 31, 2014.
	Any reference to square footage or occupancy is unaudited and outside the scope of our independent registered public accounting firm’s audit of the Company’s financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Asset Impairment
	The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of the asset to aggregate future net cash flows (undiscounted and without interest) expected to be generated by the asset. If such assets are considered impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceed the fair value. Management does not believe that the value of any of the Company’s real estate investments was impaired at December 31, 2014.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents
	The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.  Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed the federally insured limit by the Federal Deposit Insurance Corporation.  The Company has not experienced any losses related to these balances.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash
	The terms of several of the Company’s mortgage loans payable require the Company to deposit certain replacement and other reserves with its lenders.  Such “restricted cash” is generally available only for property-level requirements for which the reserves have been established and is not available to fund other property-level or Company-level obligations.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition
	Management has determined that all of the Company’s leases with its various tenants are operating leases.  Rental income is generally recognized based on the terms of leases entered into with tenants.  In those instances in which the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant.  When the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin.  Minimum rental income from leases with scheduled rent increases is recognized on a straight-line basis over the lease term.  Percentage rent is recognized when a specific tenant’s sales breakpoint is achieved.  Property operating expense recoveries from tenants of common area maintenance, real estate taxes and other recoverable costs are recognized in the period the related expenses are incurred.  Lease incentives are amortized as a reduction of rental revenue over the respective tenant lease terms.
	Termination fees (included in rental revenue) are fees that the Company has agreed to accept in consideration for permitting certain tenants to terminate their lease prior to the contractual expiration date.  The Company recognizes termination fees in accordance with Securities and Exchange Commission’s guidance when the following conditions are met:  (a) the termination agreement is executed; (b) the termination fee is determinable; (c) all landlord services pursuant to the terminated lease have been rendered; and (d) collectivity of the termination fee is assured.  Interest income is recognized as it is earned.  Gains or losses on disposition of properties are recorded when the criteria for recognizing such gains or losses under generally accepted accounting principles have been met.
	The Company must make estimates as to the collectability of its accounts receivable related to base rent, straight-line rent, expense reimbursements and other revenues.  Management analyzes accounts receivable and the allowance for bad debts by considering tenant creditworthiness, current economic trends, and changes in tenants’ payment patterns when evaluating the adequacy of the allowance for doubtful accounts receivable.  The Company also provides an allowance for future credit losses of the deferred straight-line rents receivable.  The provision for doubtful accounts at December 31, 2014 and December 31, 2013 was approximately $3.6 million and $3.2 million, respectively.
Depreciation, Depletion, and Amortization [Policy Text Block]	Depreciation and Amortization
	The Company uses the straight-line method for depreciation and amortization.  Buildings are depreciated over the estimated useful lives which the Company estimates to be 39-40 years.  Property improvements are depreciated over the estimated useful lives that range from 10 to 20 years.  Furniture and fixtures are depreciated over the estimated useful lives that range from 3 to 10 years.  Tenant improvements are amortized over the shorter of the life of the related leases or their useful life.
Deferred Charges, Policy [Policy Text Block]	Deferred Charges
	Deferred charges consist principally of leasing commissions and acquired lease origination costs (which are amortized ratably over the life of the tenant leases) and financing fees (which are amortized over the term of the related debt obligation).  Deferred charges in the accompanying consolidated balance sheets are shown at cost, net of accumulated amortization of approximately $18.8 million and $14.9 million, as of December 31, 2014 and 2013, respectively.
	The unamortized balances of deferred charges as of December 31, 2014 that will be charged to future operations are as follows:
		Lease Origination			Financing Costs			Total
		Costs
	2015	$	6,655,924		$	1,722,372		$	8,378,296
	2016		5,366,837			1,668,862			7,035,699
	2017		4,212,704			1,627,525			5,840,229
	2018		3,128,972			1,607,781			4,736,753
	2019		2,379,626			576,295			2,955,921
	Thereafter		8,621,371			2,162,704			10,784,075
		$	30,365,434		$	9,365,539		$	39,730,973
Capitalized Leasing Costs, Policy [Policy Text Block]	Internal Capitalized Leasing Costs
	The Company capitalizes a portion of payroll-related costs related to its leasing personnel associated with new leases and lease renewals. These costs are amortized over the life of the respective leases. During the years ended December 31, 2014, 2013 and 2012, the Company capitalized approximately $947,000, $742,000 and $695,000, respectively, of such payroll-related costs.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk
	Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and tenant receivables.  The Company places its cash and cash equivalents in excess of insured amounts with high quality financial institutions.  The Company performs ongoing credit evaluations of its tenants and requires tenants to provide security deposits.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share
	Basic earnings (loss) per share (“EPS”) excludes the impact of dilutive shares and is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding for the period.  Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue shares of common stock were exercised or converted into shares of common stock and then shared in the earnings of the Company.
	During the years ended December 31, 2014, 2013 and 2012, the effect of approximately 41,400,000 warrants to purchase the Company’s common stock  (the “Public Warrants”) issued in connection with the Company’s initial public offering (the “IPO”), and the 8,000,000 warrants (the “Private Placement Warrants”) purchased by NRDC Capital Management, LLC simultaneously with the consummation of the IPO, for the time these were outstanding during these periods, were included in the calculation of diluted EPS since the weighted average share price was greater than the exercise price during these periods.
	For the years ended December 31, 2014, 2013 and 2012, basic EPS was determined by dividing net income allocable to common stockholders for the applicable period by the weighted average number of shares of common stock outstanding during such period. Net income during the applicable period is also allocated to the time-based unvested restricted stock as these grants are entitled to receive dividends and are therefore considered a participating security. Time-based unvested restricted stock is not allocated net losses and/or any excess of dividends declared over net income; such amounts are allocated entirely to the common stockholders other than the holders of time-based unvested restricted stock. The performance-based restricted stock grants awarded under the 2009 Plan described in Note 9 are excluded from the basic EPS calculation, as these units are not participating securities.
	The following table sets forth the reconciliation between basic and diluted EPS for ROIC:
		Year Ended December 31,
		2014			2013			2012
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less income from continuing operations attributable to non-controlling interests		(748,177	)		(164,892	)		—
	Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for common shareholders, basic		20,141,556			34,448,729			7,679,252
	Loss from discontinued operations available to common shareholders, basic		—			(713,529	)		—
	Net income available to common stockholders, basic	$	20,141,556		$	33,735,200		$	7,679,252
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for common shareholders, diluted		20,889,733			34,613,621			7,679,252
	Loss from discontinued operations available to common shareholders, diluted		—			(713,529	)		—
	Net income available to common stockholders, diluted	$	20,889,733		$	33,900,092		$	7,679,252
	Denominator:
	Denominator for basic EPS – weighted average common shares		83,411,230			67,419,497			51,059,408
	Warrants		631,086			2,568,822			1,165,663
	OP Units		3,162,658			838,508			—
	Restricted stock awards - performance-based		162,327			113,066			95,466
	Stock Options		86,108			64,487			50,631
	Denominator for diluted EPS – weighted average common equivalent shares		87,453,409			71,004,380			52,371,168
	Earnings Per Unit
	The following table sets forth the reconciliation between basic and diluted earnings per unit for the Operating Partnership:
		Year Ended December 31,
		2014			2013			2012
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less earnings allocated to unvested units		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for unitholders, basic and diluted		20,889,733			34,613,621			7,679,252
	Loss from discontinued operations available to unitholders, basic and diluted		—			(713,529	)		—
	Net income available to unitholders, basic and diluted	$	20,889,733		$	33,900,092		$	7,679,252
	Denominator:
	Denominator for basic EPS – weighted average common units		86,573,888			68,258,005			51,059,408
	Warrants		631,086			2,568,822			1,165,663
	Restricted stock awards - performance-based		162,327			113,066			95,466
	Stock Options		86,108			64,487			50,631
	Denominator for diluted EPS – weighted average common equivalent units		87,453,409			71,004,380			52,371,168
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-Based Compensation
	The Company has a stock-based employee compensation plan, which is more fully described in Note 9.
	The Company accounts for its stock-based compensation plans based on the FASB guidance which requires that compensation expense be recognized based on the fair value of the stock awards less estimated forfeitures.  Restricted stock grants vest based upon the completion of a service period (“time-based grants”) and/or the Company meeting certain established financial performance criteria (“performance-based grants”).  Time-based grants are valued according to the market price for the Company’s common stock at the date of grant.  For performance-based grants, a Monte Carlo valuation model is used, taking into account the underlying contingency risks associated with the performance criteria.  It is the Company’s policy to grant options with an exercise price equal to the quoted closing market price of stock on the grant date.  Awards of stock options and time-based grants of stock are expensed as compensation on a straight-line basis over the vesting period.  Awards of performance-based grants are expensed as compensation under an accelerated method and are recognized in income regardless of the results of the performance criteria.
Derivatives, Policy [Policy Text Block]	Derivatives
	The Company records all derivatives on the balance sheet at fair value.  The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.  Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges.  Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.  Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. When the Company terminates a derivative for which cash flow hedging was being applied, the balance which was recorded in Other Comprehensive Income is amortized to interest expense over the remaining contractual term of the swap. The Company includes cash payments made to terminate interest rate swaps as an operating activity on the statement of cash flows, given the nature of the underlying cash flows that the derivative was hedging.
Segment Reporting, Policy [Policy Text Block]	Segment Reporting
	The Company’s primary business is the ownership, management, and redevelopment of retail real estate properties. The Company reviews operating and financing information for each property on an individual basis and therefore, each property represents an individual operating segment. The Company evaluates financial performance using property operating income, defined as operating revenues (base rent and recoveries from tenants), less property and related expenses (property operating expenses and property taxes). The Company has aggregated the properties into one reportable segment as the properties share similar long-term economic characteristics and have other similarities including the fact that they are operated using consistent business strategies, are typically located in major metropolitan areas, and have similar tenant mixes.
Reclassification, Policy [Policy Text Block]	Reclassifications
	Certain reclassifications have been made to the prior period consolidated financial statements and notes to conform to the current year presentation.

Note_1_Organization_Basis_of_P1

Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) [Line Items]
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]		Lease Origination			Financing Costs			Total
		Costs
	2015	$	6,655,924		$	1,722,372		$	8,378,296
	2016		5,366,837			1,668,862			7,035,699
	2017		4,212,704			1,627,525			5,840,229
	2018		3,128,972			1,607,781			4,736,753
	2019		2,379,626			576,295			2,955,921
	Thereafter		8,621,371			2,162,704			10,784,075
		$	30,365,434		$	9,365,539		$	39,730,973
ROIC [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]		Year Ended December 31,
		2014			2013			2012
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less income from continuing operations attributable to non-controlling interests		(748,177	)		(164,892	)		—
	Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for common shareholders, basic		20,141,556			34,448,729			7,679,252
	Loss from discontinued operations available to common shareholders, basic		—			(713,529	)		—
	Net income available to common stockholders, basic	$	20,141,556		$	33,735,200		$	7,679,252
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less earnings allocated to unvested shares		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for common shareholders, diluted		20,889,733			34,613,621			7,679,252
	Loss from discontinued operations available to common shareholders, diluted		—			(713,529	)		—
	Net income available to common stockholders, diluted	$	20,889,733		$	33,900,092		$	7,679,252
	Denominator:
	Denominator for basic EPS – weighted average common shares		83,411,230			67,419,497			51,059,408
	Warrants		631,086			2,568,822			1,165,663
	OP Units		3,162,658			838,508			—
	Restricted stock awards - performance-based		162,327			113,066			95,466
	Stock Options		86,108			64,487			50,631
	Denominator for diluted EPS – weighted average common equivalent shares		87,453,409			71,004,380			52,371,168
		Year Ended December 31,
		2014			2013			2012
	Numerator:
	Income from continuing operations	$	21,049,222		$	34,691,982		$	7,892,613
	Less earnings allocated to unvested units		(159,489	)		(78,361	)		(213,361	)
	Income from continuing operations available for unitholders, basic and diluted		20,889,733			34,613,621			7,679,252
	Loss from discontinued operations available to unitholders, basic and diluted		—			(713,529	)		—
	Net income available to unitholders, basic and diluted	$	20,889,733		$	33,900,092		$	7,679,252
	Denominator:
	Denominator for basic EPS – weighted average common units		86,573,888			68,258,005			51,059,408
	Warrants		631,086			2,568,822			1,165,663
	Restricted stock awards - performance-based		162,327			113,066			95,466
	Stock Options		86,108			64,487			50,631
	Denominator for diluted EPS – weighted average common equivalent units		87,453,409			71,004,380			52,371,168

Note_2_Real_Estate_Investments1

Note 2 - Real Estate Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]		December 31,		December 31,
		2014		2013
	ASSETS
	Land	$	98,897,045	$	176,977,162
	Building and improvements		317,400,652		310,098,731
	Cash and cash equivalents		—		552,213
	Acquired lease intangible asset		32,201,585		28,332,445
	Deferred charges		10,335,846		12,041,794
	Tenant receivables and other assets		—		1,132,232
	Assets acquired	$	458,835,128	$	529,134,577
	LIABILITIES
	Acquired lease intangible liability	$	44,287,149	$	35,039,360
	Mortgage notes assumed		—		62,749,675
	Accrued expenses and other liabilities		—		4,282,450
	Liabilities assumed	$	44,287,149	$	102,071,485
Business Acquisition, Pro Forma Information [Table Text Block]		Year Ended December 31,
	Statement of operations:	2014		2013
	Revenues	$	171,900,319	$	169,032,796
	Property operating and other expenses		83,532,767		59,987,450
	Depreciation and amortization		64,650,002		64,885,935
	Net income attributable to Retail Opportunity Investments Corp.	$	23,717,550	$	44,159,411
Condensed Income Statement [Table Text Block]		Year Ended December 31, 2014
	Statement of operations:
	Revenues	$	16,234,264
	Property operating and other expenses		4,643,335
	Depreciation and amortization		7,673,714
	Net income attributable to Retail Opportunity Investments Corp.	$	3,917,215
		Year Ended December 31, 2013
	Statement of operations:
	Revenues	$	15,813,152
	Property operating and other expenses		6,010,175
	Depreciation and amortization		7,655,138
	Net income attributable to Retail Opportunity Investments Corp.	$	2,147,839

Note_3_Acquired_Lease_Intangib1

Note 3 - Acquired Lease Intangibles (Tables)	12 Months Ended
	Dec. 31, 2014
Note 3 - Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]		December 31,			December 31,
		2014			2013
	Assets:
	In-place leases	$	78,548,975		$	71,846,161
	Accumulated amortization		(25,482,306	)		(27,413,310	)
	Above-market leases		26,197,169			18,191,431
	Accumulated amortization		(7,831,174	)		(6,736,811	)
	Acquired lease intangible assets, net	$	71,432,664		$	55,887,471
	Liabilities:
	Below-market leases	$	141,552,303		$	104,092,901
	Accumulated amortization		(23,193,642	)		(18,809,019	)
	Acquired lease intangible liabilities, net	$	118,358,661		$	85,283,882
Acquired Lease Intangible Assets [Member]
Note 3 - Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31:
	2015	$	14,563,383
	2016		11,074,212
	2017		8,839,630
	2018		6,450,192
	2019		4,460,270
	Thereafter		26,044,977
	Total future amortization of acquired lease intangible assets	$	71,432,664
Acquired Lease Intangible Liabilities [Member]
Note 3 - Acquired Lease Intangibles (Tables) [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31:
	2015	$	10,630,084
	2016		9,084,320
	2017		8,257,567
	2018		7,623,632
	2019		6,956,023
	Thereafter		75,807,035
	Total future amortization of acquired lease intangible liabilities	$	118,358,661

Note_4_Tenant_Leases_Tables

Note 4 - Tenant Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Operating Leases of Lessor Disclosure [Table Text Block]	Year ending December 31:
	2015	$	117,472,132
	2016		106,814,051
	2017		92,470,433
	2018		75,006,572
	2019		59,197,187
	Thereafter		287,159,418
	Total minimum lease payments	$	738,119,793

Note_6_Mortgage_Notes_Payable_1

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]	Property	Maturity Date		Interest Rate				31-Dec-14				December 31, 2013
	Euclid Plaza	Nov-14			5.23	%		$	—				8,158,676
	Country Club Gate Center	Jan-15			5.04	%			—				12,236,374
	Renaissance Towne Centre	Jun-15			5.13	%			16,204,826				16,489,812
	Crossroads Shopping Center	Sep-15			6.5	%			48,581,419				49,413,976
	Gateway Village III	Jul-16			6.1	%			7,270,256				7,368,521
	Bernardo Heights Plaza	Jul-17			5.7	%			8,581,168				8,748,605
	Santa Teresa Village	Feb-18			6.2	%			10,829,884				11,033,511
								$	91,467,553			$	113,449,475
	Mortgage Premium								2,715,705				5,453,783
	Total mortgage notes payable							$	94,183,258			$	118,903,258
Schedule of Maturities of Long-term Debt [Table Text Block]		Principal Repayments				Scheduled Amortization				Mortgage Premium				Total
	2015	$	64,051,173			$	1,236,553			$	1,793,132			$	67,080,858
	2016		7,120,172				462,666				515,867				8,098,705
	2017		8,099,320				361,092				380,470				8,840,882
	2018		10,094,220				42,357				26,236				10,162,813
		$	89,364,885			$	2,102,668			$	2,715,705			$	94,183,258
Schedule of Long-term Debt Instruments [Table Text Block]		December 31,				December 31,
		2014				2013
	Principal amount	$	250,000,000			$	—
	Unamortized debt discount		(3,478,886	)			—
	Senior Notes Due 2024:	$	246,521,114			$	—
		December 31,				December 31,
		2014				2013
	Principal amount	$	250,000,000			$	250,000,000
	Unamortized debt discount		(3,826,073	)			(4,154,680	)
	Senior Notes Due 2023:	$	246,173,927			$	245,845,320

Note_9_Stock_Compensation_and_1

Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]		Shares			Weighted Average
					Grant Date Fair Value
	Non-vested at December 31, 2013		440,650		$	11.4
	Granted		320,500		$	13.42
	Vested		(192,459	)	$	12.76
	Forfeited		(9,333	)	$	13.65
	Non-vested at December 31, 2014		559,358		$	11.51

Note_12_Derivative_and_Hedging1

Note 12 - Derivative and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]		Quoted Prices				Significant				Significant			Total
		in Active				Other				Unobservable
		Markets for				Observable				Inputs (Level 3)
		Identical Assets				Inputs (Level 2)
		and Liabilities
		(Level 1)
	December 31, 2013:
	Assets
	Derivative financial instruments	$	—			$	1,948,243			$	—		$	1,948,243
	Liabilities
	Derivative financial instruments	$	—			$	(2,528,703	)		$	—		$	(2,528,703	)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Derivatives designed as hedging instruments	Balance sheet		31-Dec-14				December 31, 2013
		location		Fair Value				Fair Value
	Interest rate products	Other assets		$	—			$	1,948,243
	Interest rate products	Other liabilities		$	—			$	(2,528,703	)
Derivative Instruments, Gain (Loss) [Table Text Block]		Year Ended December 31, 2014				Year Ended December 31, 2013				Year Ended December 31, 2012
	Amount of (loss) gain recognized in OCI on derivative	$	(3,131,969	)		$	4,564,248			$	(7,859,264	)
	Amount of  loss reclassified from accumulated OCI into interest	$	3,218,689			$	4,621,227			$	3,799,482
	Amount of gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	$	112			$	3,172			$	(7,534	)

Note_13_Commitments_and_Contin1

Note 13 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]		Operating
		Leases
	2015	$	910,164
	2016		980,650
	2017		1,048,825
	2018		1,053,877
	2019		1,058,807
	Thereafter		37,271,404
	Total minimum lease payments	$	42,323,727

Note_15_Quarterly_Results_of_O1

Note 15 - Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Note 15 - Quarterly Results of Operations (Unaudited) (Tables) [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]		Year Ended December 31, 2014
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	36,350,136	$	36,914,834	$	40,855,871	$	41,742,670
	Net income	$	3,266,243	$	6,050,762	$	6,980,696	$	4,751,521
	Net income attributable to ROIC	$	3,131,685	$	5,833,750	$	6,748,847	$	4,586,763
	Basic income per share	$	0.04	$	0.08	$	0.07	$	0.05
	Diluted income per share	$	0.04	$	0.07	$	0.07	$	0.05
		Year Ended December 31, 2013
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	24,384,449	$	26,063,466	$	27,147,631	$	33,636,485
	Net income	$	2,289,886	$	2,471,012	$	25,262,291	$	3,955,264
	Net income attributable to ROIC	$	2,289,886	$	2,471,012	$	25,262,291	$	3,790,372
	Basic income per share	$	0.04	$	0.04	$	0.35	$	0.05
	Diluted income per share	$	0.04	$	0.03	$	0.34	$	0.05
Retail Opportunity Investments Partnership L.P. [Member]
Note 15 - Quarterly Results of Operations (Unaudited) (Tables) [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]		Year Ended December 31, 2014
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	36,350,136	$	36,914,834	$	40,855,871	$	41,742,670
	Net income attributable to the Operating Partnership	$	3,266,243	$	6,050,762	$	6,980,696	$	4,751,521
	Basic income per unit	$	0.04	$	0.07	$	0.07	$	0.05
	Diluted income per unit	$	0.04	$	0.07	$	0.07	$	0.05
		Year Ended December 31, 2013
		31-Mar		30-Jun		30-Sep		31-Dec
	Total revenues	$	24,384,449	$	26,063,466	$	27,147,631	$	33,636,485
	Net income attributable to the Operating Partnership	$	2,289,886	$	2,471,012	$	25,262,291	$	3,955,264
	Basic income per unit	$	0.04	$	0.04	$	0.35	$	0.05
	Diluted income per unit	$	0.04	$	0.03	$	0.34	$	0.05

Schedule_III_Real_Estate_and_A1

Schedule III - Real Estate and Accumulated Depreciation (Tables)	12 Months Ended
	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule of Real Estate Properties [Table Text Block]							Initial Cost to Company					Cost Capitalized Subsequent to Acquisition					Amount at Which Carried at Close of Period
										Building &					Building &				Building &				Accumulated		Date of
		Description and Location		Encumbrances			Land			Improvements		Land			Improvements		Land		Improvements		Total (a)		Depreciation (b)(1)		Acquisition
		Paramount Plaza, CA		$	—		$	6,346,871		$	10,274,425	$	94,202		$	1,300,527	$	6,441,073	$	11,574,952		18,016,025	$	1,636,418	12/22/09
		Santa Ana Downtown Plaza, CA			—			7,895,272			9,890,440		—			1,013,833		7,895,272		10,904,273		18,799,545		1,623,119	1/26/10
		Meridian Valley Plaza, WA			—			1,880,637			4,794,789		—			304,352		1,880,637		5,099,141		6,979,778		857,027	2/1/10
		The Market at Lake Stevens, WA			—			3,086,933			12,397,178		—			28,045		3,086,933		12,425,223		15,512,156		1,828,016	3/16/10
		Norwood Shopping Center, CA			—			3,031,309			11,534,239		—			616,789		3,031,309		12,151,028		15,182,337		1,750,339	4/5/10
		Pleasant Hill Marketplace, CA			—			6,359,471			6,927,347		—			741,054		6,359,471		7,668,401		14,027,872		1,251,013	4/8/10
		Vancouver Market Center, WA			—			4,080,212			6,912,155		—			417,874		4,080,212		7,330,029		11,410,241		932,838	6/17/10
		Happy Valley Town Center, OR			—			11,678,257			27,011,054		—			1,658,102		11,678,257		28,669,156		40,347,413		4,084,559	7/14/10
		Cascade Summit, OR			—			8,852,543			7,731,944		—			317,464		8,852,543		8,049,408		16,901,951		1,298,293	8/20/10
		Heritage Market Center, WA			—			6,594,766			17,399,233		—			450,562		6,594,766		17,849,795		24,444,561		2,345,418	9/23/10
		Claremont Center, CA (2)			—			5,975,391			1,018,505		183,362			4,262,940		6,158,753		5,281,445		11,440,198		1,151,120	9/23/10
		Shops At Sycamore Creek, CA			—			3,747,011			11,583,858		—			818,932		3,747,011		12,402,790		16,149,801		2,061,442	9/30/10
		Gateway Village, CA			7,270,256			5,916,530			27,298,339		—			63,677		5,916,530		27,362,016		33,278,546		3,220,700	12/16/10
		Division Crossing, OR			—			3,705,536			8,327,097		—			5,582,839		3,705,536		13,909,936		17,615,472		1,300,209	12/22/10
		Halsey Crossing, OR (2)			—			—			7,773,472		—			533,823		—		8,307,295		8,307,295		1,086,018	12/22/10
		Marketplace Del Rio,CA			—			13,420,202			22,251,180		—			1,180,925		13,420,202		23,432,105		36,852,307		3,187,779	1/3/11
		Pinole Vista, CA			—			9,233,728			17,553,082		—			1,935,156		9,233,728		19,488,238		28,721,966		2,694,503	1/6/11
		Desert Spring Marketplace, CA			—			8,517,225			18,761,350		(159,973	)		1,368,969		8,357,252		20,130,319		28,487,571		2,570,171	2/17/11
		Mills Shopping Center, CA			—			4,083,583			16,833,059		—			4,483,090		4,083,583		21,316,149		25,399,732		2,820,007	2/17/11
		Morada Ranch, CA			—			2,503,605			19,546,783		—			344,846		2,503,605		19,891,629		22,395,234		2,344,922	5/20/11
		Renaissance, CA			16,204,826			8,640,261			13,848,388		—			453,255		8,640,261		14,301,643		22,941,904		1,538,941	8/3/11
		Country Club Gate, CA			—			6,487,457			17,340,757		—			761,367		6,487,457		18,102,124		24,589,581		2,057,986	7/8/11
		Canyon Park, WA			—			9,352,244			11,291,210		—			1,317,512		9,352,244		12,608,722		21,960,966		1,829,222	7/29/11
		Hawks Prairie, WA			—			5,334,044			20,693,920		—			418,156		5,334,044		21,112,076		26,446,120		2,344,695	9/8/11
		Kress Building, WA			—			5,692,748			20,866,133		—			4,411,012		5,692,748		25,277,145		30,969,893		2,427,821	9/30/11
		Round Hill Square, CA			—			6,358,426			17,734,397		—			784,336		6,358,426		18,518,733		24,877,159		2,003,528	8/23/11
		Hillsboro, OR  (2)			—			—			18,054,929		—			524,993		—		18,579,922		18,579,922		1,826,652	11/23/11
		Gateway Shopping Center, WA (2)			—			6,241,688			23,461,824		—			36,902		6,241,688		23,498,726		29,740,414		2,027,163	2/16/12
		Euclid Plaza, CA			—			7,407,116			7,752,767		—			2,718,623		7,407,116		10,471,390		17,878,506		1,052,527	3/28/12
		Green Valley, CA			—			1,684,718			8,999,134		—			259,758		1,684,718		9,258,892		10,943,610		920,097	4/2/12
		Aurora Square, WA			—			3,002,147			1,692,681		—			—		3,002,147		1,692,681		4,694,828		286,108	5/3/12
		Marlin Cove, CA			—			8,814,850			6,797,289		—			1,353,773		8,814,850		8,151,062		16,965,912		776,448	5/4/12
		Seabridge, CA			—			5,098,187			17,164,319		—			540,926		5,098,187		17,705,245		22,803,432		1,581,515	5/31/12
		Novato, CA			—			5,329,472			4,411,801		—			629,040		5,329,472		5,040,841		10,370,313		364,275	7/24/12
		Glendora, CA			—			5,847,407			8,758,338		—			157,145		5,847,407		8,915,483		14,762,890		808,081	8/1/12
		Wilsonville, WA			—			4,180,768			15,394,342		—			230,572		4,180,768		15,624,914		19,805,682		1,183,988	8/1/12
		Bay Plaza, CA			—			5,454,140			14,857,031		—			1,023,146		5,454,140		15,880,177		21,334,317		1,182,562	10/5/12
		Santa Theresa, CA			10,829,884			14,964,975			17,162,039		—			2,031,796		14,964,975		19,193,835		34,158,810		1,453,022	11/8/12
		Cypress West, CA			—			15,479,535			11,819,089		—			1,924,075		15,479,535		13,743,164		29,222,699		938,737	12/7/12
		Redondo Beach, CA			—			16,241,947			13,624,837		—			84,973		16,241,947		13,709,810		29,951,757		956,869	12/28/12
		Harbor Place, CA			—			16,506,423			10,527,092		—			333,180		16,506,423		10,860,272		27,366,695		645,918	12/28/12
		Diamond Bar Town Center, CA			—			9,540,204			16,794,637		—			3,976,039		9,540,204		20,770,676		30,310,880		1,159,965	2/1/13
		Bernardo Heights, CA			8,581,168			3,191,950			8,939,685		—			51,868		3,191,950		8,991,553		12,183,503		531,355	2/6/13
		Canyon Crossing, WA			—			7,940,521			24,659,249		—			2,311,882		7,940,521		26,971,131		34,911,652		1,495,164	4/15/13
		Diamond Hills, CA			—			15,457,603			29,352,602		—			360,963		15,457,603		29,713,565		45,171,168		1,707,176	4/22/13
		Granada Shopping Center, CA			—			3,673,036			13,459,155		—			62,418		3,673,036		13,521,573		17,194,609		760,336	6/27/13
		Hawthorne Crossings, CA			—			10,382,740			29,277,254		—			270,950		10,382,740		29,548,204		39,930,944		1,426,033	6/27/13
		Robinwood, CA			—			3,996,984			11,317,359		—			273,267		3,996,984		11,590,626		15,587,610		520,197	8/23/13
		Five Points Plaza, CA			—			18,419,733			36,965,189		—			339,524		18,419,733		37,304,713		55,724,446		1,346,888	9/27/13
		Crossroads Shopping Center, CA			48,581,419			68,366,245			67,755,526		—			1,636,435		68,366,245		69,391,961		137,758,206		3,100,476	9/27/13
		Peninsula Marketplace, CA			—			14,730,088			19,213,763		—			232,920		14,730,088		19,446,683		34,176,771		770,754	11/1/13
		Country Club Village, CA			—			9,985,749			26,578,916		—			1,270,337		9,985,749		27,849,253		37,835,002		1,065,833	11/26/13
		Plaza de la Canada, CA			—			10,351,028			24,819,026		—			331,346		10,351,028		25,150,372		35,501,400		798,279	12/13/13
		Tigard Marketplace, CA			—			13,586,729			9,603,492		—			257,816		13,586,729		9,861,308		23,448,037		386,341	2/18/14
		Creekside Plaza, CA			—			14,806,966			29,475,850		—			8,024		14,806,966		29,483,874		44,290,840		918,875	2/28/14
		North Park Plaza, CA			—			13,592,522			17,733,266		—			—		13,592,522		17,733,266		31,325,788		355,356	4/30/14
		Aurora Square II, WA			—			6,861,740			9,797,749		—			4,113		6,861,740		9,801,862		16,663,602		249,028	5/22/14
		Fallbrook Shopping Center (2)			—			21,232,016			186,197,471		—			2,409,052		21,232,016		188,606,523		209,838,539		3,200,972	6/13/14
		Moorpark Town Center, CA			—			7,062,639			19,693,955		—			—		7,062,639		19,693,955		26,756,594		44,277	12/3/14
		Mission Foothill Marketplace, CA			—			11,414,592			17,782,506		—			—		11,414,592		17,782,506		29,197,098		38,956	12/4/14
		Wilsonville Town Center, OR			—			10,339,839			27,116,367		—			—		10,339,839		27,116,367		37,456,206		47,007	12/11/14
			$	91,467,553		$	549,960,559		$	1,174,604,863	$	117,591		$	61,215,293	$	550,078,150	$	1,235,820,156	$	1,785,898,306	$	88,173,334
Other Real Estate, Roll Forward [Table Text Block]			Year Ended December 31,
			2014			2013			2012
	Balance at beginning of period:		$	1,372,433,648		$	871,693,595		$	580,832,410
	Property improvements during the year			27,514,974			19,513,924			12,264,027
	Properties acquired during the year			416,297,696			487,309,488			278,597,158
	Properties sold during the year			(23,675,678	)		(6,083,359	)		—
	Assets written off during the year			(6,672,334	)		—			—
	Balance at end of period:		$	1,785,898,306		$	1,372,433,648		$	871,693,595
Reconciliation of Real Estate Accumulated Depreciation [Table Text Block]			Year Ended December 31,
			2014			2013			2012
	Balance at beginning of period:		$	57,499,980		$	32,364,772		$	14,451,032
	Depreciation expenses			38,890,425			25,653,359			17,913,740
	Properties sold during the year			(2,081,460	)		(433,342	)		—
	Property assets fully depreciated and written off			(6,135,611	)		(84,809	)		—
	Balance at end of period:		$	88,173,334		$	57,499,980		$	32,364,772

Schedule_IV_Mortgage_Loans_on_1

Schedule IV - Mortgage Loans on Real Estate (Tables)	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]
Movement in Mortgage Loans on Real Estate Roll Forward [Table Text Block]		Year Ended December 31,
		2014		2013			2012
	Balance at beginning of period:	$	—	$	10,000,000		$	10,000,000
	Mortgage loans eliminated upon consolidation of joint venture		—		(10,000,000	)		—
	Balance at end of period:	$	—	$	—		$	10,000,000

Note_1_Organization_Basis_of_P2

Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 27, 2013	Jun. 05, 2014	Jun. 30, 2014	Aug. 25, 2014	Aug. 31, 2014
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Taxable Income Minimum Distribution Portion Not Subject to Federal Taxation, Percentage	90.00%
Tax Adjustments, Settlements, and Unusual Provisions			$122,000
SEC Schedule III, Real Estate, Improvements	27,500,000	19,200,000
Number of Years from Aquisition Date	1 year
Acquisition Costs, Period Cost	961,167	1,688,521	1,347,611
Proceeds from Sale of Real Estate	27,622,089	5,607,612
Gains (Losses) on Sales of Investment Real Estate	4,868,553
Allowance for Doubtful Accounts Receivable	3,600,000	3,200,000
Deferred Costs, Leasing, Accumulated Amortization	18,800,000	14,900,000
Payroll Related Costs Capitalized	947,000	742,000	695,000
Number of Reportable Segments	1
Public Warrants [Member] | Original Number Outstanding [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Class of Warrant or Right, Outstanding (in Shares)	41,400,000	41,400,000	41,400,000
Private Placement Warrants [Member] | Original Number Outstanding [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Class of Warrant or Right, Outstanding (in Shares)	8,000,000	8,000,000	8,000,000
Building [Member] | Minimum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Building [Member] | Maximum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Building Improvements [Member] | Minimum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building Improvements [Member] | Maximum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Furniture and Fixtures [Member] | Minimum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years
OP Units [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)				3,290,263
Phillips Village Shopping Center [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Shopping Center Occupancy, Percentage					10.40%	10.40%
Sales Price of Property Sold					16,000,000	16,000,000
Proceeds from Sale of Real Estate					15,600,000	15,600,000
Gains (Losses) on Sales of Investment Real Estate	3,300,000
Oregon City Point Shopping Center [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Sales Price of Property Sold							12,400,000	12,400,000
Proceeds from Sale of Real Estate							12,000,000	12,000,000
Gains (Losses) on Sales of Investment Real Estate	$1,600,000						$1,600,000

Note_1_Organization_Basis_of_P3

Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges [Line Items]
2015	$8,378,296
2016	7,035,699
2017	5,840,229
2018	4,736,753
2019	2,955,921
Thereafter	10,784,075
	39,730,973	33,121,980
Deferred Lease Origination Costs [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges [Line Items]
2015	6,655,924
2016	5,366,837
2017	4,212,704
2018	3,128,972
2019	2,379,626
Thereafter	8,621,371
	30,365,434
Deferred Financing Costs [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Unamortized Balances of Deferred Charges [Line Items]
2015	1,722,372
2016	1,668,862
2017	1,627,525
2018	1,607,781
2019	576,295
Thereafter	2,162,704
	$9,365,539

Note_1_Organization_Basis_of_P4

Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Income from continuing operations	$21,049,222	$34,691,982	$7,892,613
Less income from continuing operations attributable to non-controlling interests	-748,177	-164,892
Less earnings allocated to unvested shares	-159,489	-78,361	-213,361
Less earnings allocated to unvested shares	-159,489	-78,361	-213,361
Income from continuing operations available for common shareholders, diluted	20,889,733	34,613,621	7,679,252
Loss from discontinued operations available to common shareholders, diluted		-713,529
Net income available to common stockholders, diluted	20,889,733	33,900,092	7,679,252
Denominator for basic EPS b weighted average common (in Shares)	83,411,230	67,419,497	51,059,408
Denominator for diluted EPS b weighted average common equivalent shares (in Shares)	87,453,409	71,004,380	52,371,168
Income from continuing operations available for common shareholders, basic	20,141,556	34,448,729	7,679,252
Loss from discontinued operations available to common shareholders, basic		-713,529
Net income available to common stockholders, basic	20,141,556	33,735,200	7,679,252
Warrant [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Warrants (in Shares)	631,086	2,568,822	1,165,663
Warrant [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Warrants (in Shares)	631,086	2,568,822	1,165,663
OP Units [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
OP Units (in Shares)	3,162,658	838,508
Performance Shares [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in Shares)	162,327	113,066	95,466
Performance Shares [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in Shares)	162,327	113,066	95,466
Employee Stock Option [Member] | Retail Opportunity Investments Partnership L.P. [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in Shares)	86,108	64,487	50,631
Employee Stock Option [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in Shares)	86,108	64,487	50,631
Retail Opportunity Investments Partnership L.P. [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Reconciliation Between Basic and Diluted EPS [Line Items]
Income from continuing operations	21,049,222	34,691,982	7,892,613
Less earnings allocated to unvested shares	-159,489	-78,361	-213,361
Income from continuing operations available for unitholders, basic and diluted	20,889,733	34,613,621	7,679,252
Loss from discontinued operations available to unitholders, basic and diluted		-713,529
Net income available to unitholders, basic and diluted	$20,889,733	$33,900,092	$7,679,252
Denominator for basic EPS b weighted average common (in Shares)	86,573,888	68,258,005	51,059,408
Denominator for diluted EPS b weighted average common equivalent shares (in Shares)	87,453,409	71,004,380	52,371,168

Note_2_Real_Estate_Investments2

Note 2 - Real Estate Investments (Details) (USD $)

12 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

1 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Sep. 27, 2013

Feb. 18, 2014

Feb. 28, 2014

Apr. 30, 2014

22-May-14

Jun. 13, 2014

Dec. 03, 2014

Dec. 04, 2014

Dec. 11, 2014

Sep. 26, 2013

Jun. 05, 2014

Jun. 30, 2014

Aug. 25, 2014

Aug. 31, 2014

sqft

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

$297,600,000

Area of Real Estate Property (in Square Feet)

1,000,000

NumberofRealEstatePropertiesAcquired

10

Gain On Consolidation of Joint Venture

20,381,849

2,144,696

Proceeds from Sale of Real Estate

27,622,089

5,607,612

Gains (Losses) on Sales of Investment Real Estate

4,868,553

Transfer of Equity Investment in Property to Real Estate Investment

15,990,769

4,008,350

Noncontrolling Interest in Joint Ventures

0

OP Units [Member] | Terranomics Crossroads Associates, LP [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Stock Issued During Period, Value, Acquisitions

36,400,000

OP Units [Member] | SARM Five Points LLC [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Stock Issued During Period, Value, Acquisitions

9,000,000

Tigard Marketplace Property [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

25,100,000

Area of Real Estate Property (in Square Feet)

137,000

Creekside Plaza [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

44,000,000

Area of Real Estate Property (in Square Feet)

129,000

North Park Plaza [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

27,800,000

Area of Real Estate Property (in Square Feet)

77,000

Aurora Square II [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

15,800,000

Area of Real Estate Property (in Square Feet)

66,000

Aurora Square and Aurora Square II [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Area of Real Estate Property (in Square Feet)

104,000

Fallbrook Shopping Center [Member] | Owned GLA [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Area of Real Estate Property (in Square Feet)

756,000

Fallbrook Shopping Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

210,000,000

Area of Real Estate Property (in Square Feet)

1,100,000

Moorpark Town Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

27,300,000

Area of Real Estate Property (in Square Feet)

134,000

Mission Foothill Marketplace [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Combination, Consideration Transferred

29,000,000

Area of Real Estate Property (in Square Feet)

111,000

Wilsonville Town Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Area of Real Estate Property (in Square Feet)

168,000

Business Acquisition Adjusted Purchase Price

35,600,000

Payments to Acquire Businesses, Gross

19,400,000

Limited Partners' Capital Account, Units Issued (in Shares)

989,272

Stock Issued During Period, Value, Acquisitions

16,300,000

Terranomics Crossroads Associates, LP [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Limited Partners' Capital Account, Units Issued (in Shares)

2,639,632

Business Acquisition, Percentage of Voting Interests Acquired

51.00%

Business Combination, Consideration Transferred, Liabilities Incurred

49,600,000

Equity Method Investment, Ownership Percentage

49.00%

49.00%

Equity Method Investments Fair Value Disclosure Prior To Acquisition

36,000,000

Gain On Consolidation of Joint Venture

20,400,000

Equity Method Investments

15,300,000

Transfer of Equity Investment in Property to Real Estate Investment

16,000,000

Crossroads Shopping Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Area of Real Estate Property (in Square Feet)

464,000

SARM Five Points LLC [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Area of Real Estate Property (in Square Feet)

161,000

Payments to Acquire Businesses, Gross

43,600,000

Limited Partners' Capital Account, Units Issued (in Shares)

650,631

Business Acquisition, Percentage of Voting Interests Acquired

100.00%

Repayment Of Other Debt By Seller

17,200,000

SARM Five Points Plaza LLC [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Business Acquisition Adjusted Purchase Price

52,600,000

Phillips Village Shopping Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Shopping Center Occupancy, Percentage

10.40%

10.40%

Sales Price of Property Sold

16,000,000

16,000,000

Proceeds from Sale of Real Estate

15,600,000

15,600,000

Gains (Losses) on Sales of Investment Real Estate

3,300,000

Oregon City Point Shopping Center [Member]

Note 2 - Real Estate Investments (Details) [Line Items]

Sales Price of Property Sold

12,400,000

12,400,000

Proceeds from Sale of Real Estate

12,000,000

12,000,000

Gains (Losses) on Sales of Investment Real Estate

$1,600,000

$1,600,000

Note_2_Real_Estate_Investments3

Note 2 - Real Estate Investments (Details) - Purchase Price Allocation of Properties Acquired (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Land	$98,897,045	$176,977,162
Building and improvements	317,400,652	310,098,731
Cash and cash equivalents		552,213
Acquired lease intangible asset	32,201,585	28,332,445
Deferred charges	10,335,846	12,041,794
Tenant receivables and other assets		1,132,232
Assets acquired	458,835,128	529,134,577
LIABILITIES
Acquired lease intangible liability	44,287,149	35,039,360	16,280,503
Mortgage notes assumed		62,749,675
Accrued expenses and other liabilities		4,282,450
Liabilities assumed	$44,287,149	$102,071,485

Note_2_Real_Estate_Investments4

Note 2 - Real Estate Investments (Details) - Pro Forma Financial Information - Results of Operations Had the Acquisitions Occured at the Beginning of the Year (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pro Forma Financial Information - Results of Operations Had the Acquisitions Occured at the Beginning of the Year [Abstract]
Revenues	$171,900,319	$169,032,796
Property operating and other expenses	83,532,767	59,987,450
Depreciation and amortization	64,650,002	64,885,935
Net income attributable to Retail Opportunity Investments Corp.	$23,717,550	$44,159,411

Note_2_Real_Estate_Investments5

Note 2 - Real Estate Investments (Details) - Operating Results Included in the Company's Historical Consolidated Statement of Operations for Properties Acquired During the Reported Periods (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
Condensed Income Statements, Captions [Line Items]
Revenues	$41,742,670	$40,855,871	$36,914,834	$36,350,136	$33,636,485	$27,147,631	$26,063,466	$24,384,449	$155,863,511	$111,232,031	$75,095,687
Property operating and other expenses									25,035,765	19,749,972	12,779,758
Depreciation and amortization									58,434,981	40,397,895	29,074,709
Net income attributable to Retail Opportunity Investments Corp.	4,586,763	6,748,847	5,833,750	3,131,685	3,790,372	25,262,291	2,471,012	2,289,886	20,301,045	33,813,561	7,892,613
Attributable to Acquired Properties During the Reporting Periods [Member]
Condensed Income Statements, Captions [Line Items]
Revenues									16,234,264	15,813,152
Property operating and other expenses									4,643,335	6,010,175
Depreciation and amortization									7,673,714	7,655,138
Net income attributable to Retail Opportunity Investments Corp.									$3,917,215	$2,147,839

Note_3_Acquired_Lease_Intangib2

Note 3 - Acquired Lease Intangibles (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Text Block [Abstract]
Amortization of above and below Market Leases	($6,944,572)	($4,444,117)	($3,659,011)
Amortization of Acquired-in-Place Leases	$12,500,000	$10,300,000	$8,100,000

Note_3_Acquired_Lease_Intangib3

Note 3 - Acquired Lease Intangibles (Details) - Intangible Assets and Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$71,432,664	$55,887,471
Below-market leases	141,552,303	104,092,901
Accumulated amortization	-23,193,642	-18,809,019
Acquired lease intangible liabilities, net	118,358,661	85,283,882
Leases, Acquired-in-Place [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	78,548,975	71,846,161
Accumulated amortization	-25,482,306	-27,413,310
Above Market Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	26,197,169	18,191,431
Accumulated amortization	($7,831,174)	($6,736,811)

Note_3_Acquired_Lease_Intangib4

Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
Total future amortization of acquired lease intangible assets	$71,432,664	$55,887,471
Acquired Lease Intangible Assets [Member]
Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Assets [Line Items]
2015	14,563,383
2016	11,074,212
2017	8,839,630
2018	6,450,192
2019	4,460,270
Thereafter	26,044,977
Total future amortization of acquired lease intangible assets	$71,432,664

Note_3_Acquired_Lease_Intangib5

Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
Total future amortization of acquired lease intangible liabilities	$118,358,661	$85,283,882
Acquired Lease Intangible Liabilities [Member]
Note 3 - Acquired Lease Intangibles (Details) - Future Amortization of Acquired Lease Intangible Liabilities [Line Items]
2015	10,630,084
2016	9,084,320
2017	8,257,567
2018	7,623,632
2019	6,956,023
Thereafter	75,807,035
Total future amortization of acquired lease intangible liabilities	$118,358,661

Note_4_Tenant_Leases_Details_M

Note 4 - Tenant Leases (Details) - Minimum Future Rentals to be Received under Non-cancellable Leases (USD $)	Dec. 31, 2014
Minimum Future Rentals to be Received under Non-cancellable Leases [Abstract]
2015	$117,472,132
2016	106,814,051
2017	92,470,433
2018	75,006,572
2019	59,197,187
Thereafter	287,159,418
Total minimum lease payments	$738,119,793

Note_5_Discontinued_Operations1

Note 5 - Discontinued Operations (Details) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 05, 2013	Dec. 31, 2012
Note 5 - Discontinued Operations (Details) [Line Items]
Proceeds from Sale of Real Estate	$27,622,089	$5,607,612
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		-713,529
Nimbus Winery Shopping Center [Member]
Note 5 - Discontinued Operations (Details) [Line Items]
Sales Price of Property Sold			6,300,000
Proceeds from Sale of Real Estate			5,600,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		-714,000
Real Estate Held-for-sale				$6,300,000

Note_6_Mortgage_Notes_Payable_2

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 12, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 03, 2014	Dec. 09, 2013	Dec. 11, 2014
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Repayments of Secured Debt		$21,981,922	$14,902,386	$7,874,618
Line of Credit Facility, Expiration Date	31-Jan-19
Long-term Line of Credit		156,500,000	56,950,000
Euclid Plaza [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Repayments of Secured Debt		8,000,000
Country Club Gate [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Repayments of Secured Debt		12,000,000
Accordion Feature [Member] | Revolving Credit Facility [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,000,000,000
Senior Notes 2024 [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Debt Instrument, Face Amount		250,000,000			250,000,000
Debt Instrument, Interest Rate, Stated Percentage					4.00%
Interest Expense, Debt		750,000
Amortization of Debt Discount (Premium)		21,000
Deferred Finance Costs, Gross		2,200,000
Senior Notes 2023 [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Debt Instrument, Face Amount		250,000,000	250,000,000			250,000,000
Debt Instrument, Interest Rate, Stated Percentage						5.00%
Interest Expense, Debt		12,400,000	800,000
Amortization of Debt Discount (Premium)		329,000	20,000
Deferred Finance Costs, Gross			2,600,000
Revolving Credit Facility [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000,000						350,000,000
Long-term Line of Credit		156,500,000
Line of Credit Facility, Interest Rate During Period		1.30%
Line of Credit Facility, Remaining Borrowing Capacity		343,500,000
Term Loan [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$200,000,000
Loan Agreements [Member] | Federal Funds Rate [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Loan Agreements [Member] | Eurodollar [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Loan Agreements [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.20%
Line of Credit, Fronting Fee		0.13%

Note_6_Mortgage_Notes_Payable_3

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Balance	$91,467,553	$113,449,475
Mortgage Premium	2,715,705	5,453,783
Total mortgage notes payable	94,183,258	118,903,258
Euclid Plaza [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	5.23%
Balance		8,158,676
Country Club Gate [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	5.04%
Balance		12,236,374
Renaissance Towne Center [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	5.13%
Balance	16,204,826	16,489,812
Crossroads Shopping Center [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	6.50%
Balance	48,581,419	49,413,976
Gateway Village III [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	6.10%
Balance	7,270,256	7,368,521
Bernardo Heights Plaza [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	5.70%
Balance	8,581,168	8,748,605
Santa Teresa Village [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Mortgage Notes Payable [Line Items]
Interest Rate	6.20%
Balance	$10,829,884	$11,033,511

Note_6_Mortgage_Notes_Payable_4

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Total	$94,183,258	$118,903,258
	2,715,705	5,453,783
	94,183,258	118,903,258
Next Twelve Months [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Principal Repayments	64,051,173
Scheduled Amortization	1,236,553
Mortgage Premium	1,793,132
Total	67,080,858
	64,051,173
	1,793,132
	67,080,858
Year Two [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Principal Repayments	7,120,172
Scheduled Amortization	462,666
Mortgage Premium	515,867
Total	8,098,705
	7,120,172
	515,867
	8,098,705
Year Three [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Principal Repayments	8,099,320
Scheduled Amortization	361,092
Mortgage Premium	380,470
Total	8,840,882
	8,099,320
	380,470
	8,840,882
Year Four [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Principal Repayments	10,094,220
Scheduled Amortization	42,357
Mortgage Premium	26,236
Total	10,162,813
	10,094,220
	26,236
	10,162,813
Mortgages [Member]
Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Combined Aggregate Principal Maturities of Mortgage Notes Payable [Line Items]
Principal Repayments	89,364,885
Mortgage Premium	2,715,705
Total	94,183,258
	89,364,885
	2,102,668
	2,715,705
	$94,183,258

Note_6_Mortgage_Notes_Payable_5

Note 6 - Mortgage Notes Payable, Credit Facilities and Senior Notes (Details) - Carrying Value of the Companybs Senior Notes (USD $)	Dec. 31, 2014	Dec. 03, 2014	Dec. 31, 2013	Dec. 09, 2013
Senior Notes 2024 [Member]
Debt Instrument [Line Items]
Principal amount	$250,000,000	$250,000,000
Unamortized debt discount	-3,478,886
Senior Notes	246,521,114
Senior Notes 2023 [Member]
Debt Instrument [Line Items]
Principal amount	250,000,000		250,000,000	250,000,000
Unamortized debt discount	-3,826,073		-4,154,680
Senior Notes	$246,173,927		$245,845,320

Note_7_Preferred_Stock_of_ROIC1

Note 7 - Preferred Stock of ROIC (Details)	Dec. 31, 2014	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]
Preferred Stock, Shares Authorized	50,000,000	50,000,000
Preferred Stock, Shares Outstanding	0	0

Note_8_Common_Stock_and_Warran1

Note 8 - Common Stock and Warrants of ROIC (Details) (USD $)

0 Months Ended

1 Months Ended

12 Months Ended

0 Months Ended

48 Months Ended

0 Months Ended

Jun. 18, 2014

31-May-10

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Feb. 04, 2013

Oct. 23, 2014

Dec. 31, 2014

Sep. 19, 2014

Jul. 31, 2013

Jun. 23, 2011

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Common Stock, Par or Stated Value Per Share (in Dollars per share)

$0.00

$0.00

$0.00

Proceeds from Issuance of Common Stock (in Dollars)

$205,500,000

$214,906,251

$37,811,658

Stock Issued During Period, Shares, New Issues

14,375,000

Number of Days Notice

30 days

Proceeds from Warrant Exercises (in Dollars)

70,723,391

226,529,778

12,000

Warrant Repurchase Program, Authorized Amount (in Dollars)

40,000,000

Warrants Repurchased During Period, Shares

0

Payments for Repurchase of Warrants (in Dollars)

32,785,921

Stock Repurchase Program, Authorized Amount (in Dollars)

50,000,000

Stock Repurchased During Period, Shares

0

Private Placement Warrants [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Warrants Purchased By Sponsor During IPO

8,000,000

Warrants, Sales Price Per Warrant (in Dollars per share)

$1

Sponsor Warrants Exercised

8,000,000

NRDC [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Stock Issued During Period, Shares, New Issues

688,500

Public Warrants [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Warrants, Repurchase Price Per Warrant (in Dollars per share)

0.01

Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)

12

Class Of Warrant Or Right Number Of Warrants Exercised

5,878,216

18,877,482

Proceeds from Warrant Exercises (in Dollars)

70,500,000

226,500,000

Class of Warrant or Right, Cancelled During Period

64,452

Public and Private Placement Warrants [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Common Stock, Capital Shares Reserved for Future Issuance

53,400,000

ATM Equity Offering Sales Agreement [Member] | Commissions Paid to Agent [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Payments of Stock Issuance Costs (in Dollars)

687,600

ATM Equity Offering Sales Agreement [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Common Stock, Par or Stated Value Per Share (in Dollars per share)

0.0001

Proceeds from Issuance of Common Stock (in Dollars)

50,000,000

39,300,000

Stock Issued During Period, Shares, New Issues

0

3,183,245

2014 Sales Agreements ATM Program [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Common Stock, Par or Stated Value Per Share (in Dollars per share)

$0.00

Stock Issued During Period, Shares, New Issues

0

Number of Sales Agreements Entered Into

4

Common Shares That May be Sold Under a Sales Agreement Aggregate Offering Price, Maximum

100,000,000

Open Market Transactions [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Warrants Repurchased During Period, Shares

744,850

Payments for Repurchase of Warrants (in Dollars)

1,400,000

Privately Negotiated Transactions [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Warrants Repurchased During Period, Shares

15,834,000

Payments for Repurchase of Warrants (in Dollars)

$31,300,000

Minimum Price Company's Common Stock Must Trade Before Warrants Issued in The IPO Can Be Redeemed [Member]

Note 8 - Common Stock and Warrants of ROIC (Details) [Line Items]

Share Price (in Dollars per share)

18.75

Note_9_Stock_Compensation_and_2

Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Allocated Share-based Compensation Expense	$3,700,000	$2,900,000	$3,400,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	25,000	20,000	17,000
Restricted Stock [Member] | The 2009 Plan [Member]
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	320,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	3,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$2,900,000	$2,400,000	$2,500,000
Restricted Stock [Member]
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	320,500
Performance Shares [Member] | The 2009 Plan [Member]
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	118,750
The 2009 Plan [Member]
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum	7.50%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares (in Shares)	4,000,000

Note_9_Stock_Compensation_and_3

Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) - Status of Non-vested Restricted Stock Awards (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Stock [Member]
Note 9 - Stock Compensation and Other Benefit Plans for ROIC (Details) - Status of Non-vested Restricted Stock Awards [Line Items]
Non-vested at December 31, 2013	440,650
Non-vested at December 31, 2013	$11.40
Non-vested at December 31, 2014	559,358
Non-vested at December 31, 2014	$11.51
Granted	320,500
Granted	$13.42
Vested	-192,459
Vested	$12.76
Forfeited	-9,333
Forfeited	$13.65

Note_10_Capital_of_the_Operati1

Note 10 - Capital of the Operating Partnership (Details) (USD $)	0 Months Ended			1 Months Ended	12 Months Ended
	Dec. 01, 2014	Nov. 14, 2014	Oct. 17, 2013	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 11, 2014
Note 10 - Capital of the Operating Partnership (Details) [Line Items]
Limited Partners' Capital Account, Units Outstanding					96,912,647
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest					95.90%
Common Stock, Shares, Outstanding					92,991,333	72,445,767
Minority Interest Decrease From Redemptions, Number of Units		200,000	158,221
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (in Dollars)	$3,300,000			$2,200,000
OP Units [Member]
Note 10 - Capital of the Operating Partnership (Details) [Line Items]
Partners' Capital Account, Units					3,921,314
Non Controlling Interest Redemption Value (in Dollars)					65,800,000
Non Controlling Interests Redemption Value Price Per Share (in Dollars per share)					16.79
Crossroads Shopping Center [Member]
Note 10 - Capital of the Operating Partnership (Details) [Line Items]
Limited Partners' Capital Account, Units Issued						2,639,632
SARM Five Points LLC [Member]
Note 10 - Capital of the Operating Partnership (Details) [Line Items]
Limited Partners' Capital Account, Units Issued						650,631
Wilsonville Town Center [Member]
Note 10 - Capital of the Operating Partnership (Details) [Line Items]
Limited Partners' Capital Account, Units Issued							989,272

Note_11_Fair_Value_of_Financia1

Note 11 - Fair Value of Financial Instruments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Note 11 - Fair Value of Financial Instruments (Details) [Line Items]
Mortgage Loans on Real Estate, Minimum Interest Rate in Range	2.80%
Mortgage Loans on Real Estate, Maximum Interest Rate in Range	3.60%
Mortgage Loans on Real Estate, Interest Rate	2.90%
Mortgages [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value of Financial Instruments (Details) [Line Items]
Notes Payable, Fair Value Disclosure	94.7
Fair Value, Inputs, Level 2 [Member] | Senior Notes 2023 [Member]
Note 11 - Fair Value of Financial Instruments (Details) [Line Items]
Long-term Debt, Fair Value	269.7
Fair Value, Inputs, Level 2 [Member] | Senior Notes 2024 [Member]
Note 11 - Fair Value of Financial Instruments (Details) [Line Items]
Long-term Debt, Fair Value	249.4

Note_12_Derivative_and_Hedging2

Note 12 - Derivative and Hedging Activities (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$2.10

Note_12_Derivative_and_Hedging3

Note 12 - Derivative and Hedging Activities (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $)	Dec. 31, 2013
Assets
Derivative financial instruments	$1,948,243
Liabilities
Derivative financial instruments	-2,528,703
Fair Value, Inputs, Level 2 [Member]
Assets
Derivative financial instruments	1,948,243
Liabilities
Derivative financial instruments	($2,528,703)

Note_12_Derivative_and_Hedging4

Note 12 - Derivative and Hedging Activities (Details) - Fair Value of Derivative Financial Instruments (USD $)	Dec. 31, 2013
Fair Value of Derivative Financial Instruments [Abstract]
Interest rate products	$1,948,243
Interest rate products	($2,528,703)

Note_12_Derivative_and_Hedging5

Note 12 - Derivative and Hedging Activities (Details) - Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Location of Gain or Loss on Interest Rate Derivatives Designated as Cash Flow Hedges [Abstract]
Amount of (loss) gain recognized in OCI on derivative	($3,131,969)	$4,564,248	($7,859,264)
Amount of loss reclassified from accumulated OCI into interest	3,218,689	4,621,227	3,799,482
Amount of gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)	$112	$3,172	($7,534)

Note_13_Commitments_and_Contin2

Note 13 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 13 - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Rent Expense, Net	$1,200,000	$1,100,000	$780,000
Terranomics Crossroads Associates, LP [Member]
Note 13 - Commitments and Contingencies (Details) [Line Items]
Equity Method Investment, Ownership Percentage		51.00%
SARM Five Points LLC [Member]
Note 13 - Commitments and Contingencies (Details) [Line Items]
Equity Method Investment, Ownership Percentage		100.00%
Terranomics Crossroads Associates LP and SARM Five Points LLC [Member]
Note 13 - Commitments and Contingencies (Details) [Line Items]
Tax Protection Agreements, Period	12 years
Wilsonville Town Center [Member]
Note 13 - Commitments and Contingencies (Details) [Line Items]
Tax Protection Agreements, Period	10 years

Note_13_Commitments_and_Contin3

Note 13 - Commitments and Contingencies (Details) - Future Minimum Annual Lease Payments Under Operating Leases (USD $)	Dec. 31, 2014
Future Minimum Annual Lease Payments Under Operating Leases [Abstract]
2015	$910,164
2016	980,650
2017	1,048,825
2018	1,053,877
2019	1,058,807
Thereafter	37,271,404
Total minimum lease payments	$42,323,727

Note_14_Related_Party_Transact1

Note 14 - Related Party Transactions (Details) (Related Party Lease Agreements [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Lease Agreements [Member]
Note 14 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	$37,000	$25,000	$9,500

Note_15_Quarterly_Results_of_O2

Note 15 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations for ROIC (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
Quarterly Results of Operations for ROIC [Abstract]
Total revenues	$41,742,670	$40,855,871	$36,914,834	$36,350,136	$33,636,485	$27,147,631	$26,063,466	$24,384,449	$155,863,511	$111,232,031	$75,095,687
Net income	4,751,521	6,980,696	6,050,762	3,266,243	3,955,264	25,262,291	2,471,012	2,289,886	21,049,222	33,978,453	7,892,613
Net income attributable to ROIC	$4,586,763	$6,748,847	$5,833,750	$3,131,685	$3,790,372	$25,262,291	$2,471,012	$2,289,886	$20,301,045	$33,813,561	$7,892,613
Basic income per share (in Dollars per share)	$0.05	$0.07	$0.08	$0.04	$0.05	$0.35	$0.04	$0.04	$0.24	$0.50	$0.15
Diluted income per share (in Dollars per share)	$0.05	$0.07	$0.07	$0.04	$0.05	$0.34	$0.03	$0.04	$0.24	$0.48	$0.15

Note_15_Quarterly_Results_of_O3

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	$41,742,670	$40,855,871	$36,914,834	$36,350,136	$33,636,485	$27,147,631	$26,063,466	$24,384,449	$155,863,511	$111,232,031	$75,095,687
Net income attributable to the Operating Partnership	4,751,521	6,980,696	6,050,762	3,266,243	3,955,264	25,262,291	2,471,012	2,289,886	21,049,222	33,978,453	7,892,613
Basic income per unit	$0.05	$0.07	$0.08	$0.04	$0.05	$0.35	$0.04	$0.04	$0.24	$0.50	$0.15
Diluted income per unit	$0.05	$0.07	$0.07	$0.04	$0.05	$0.34	$0.03	$0.04	$0.24	$0.48	$0.15
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	41,742,670	40,855,871	36,914,834	36,350,136	33,636,485	27,147,631	26,063,466	24,384,449	155,863,511	111,232,031	75,095,687
Net income attributable to the Operating Partnership	$4,751,521	$6,980,696	$6,050,762	$3,266,243	$3,955,264	$25,262,291	$2,471,012	$2,289,886	$21,049,222	$33,978,453	$7,892,613
Basic income per unit	$0.05	$0.07	$0.07	$0.04	$0.05	$0.35	$0.04	$0.04	$0.24	$0.50	$0.15
Diluted income per unit	$0.05	$0.07	$0.07	$0.04	$0.05	$0.34	$0.03	$0.04	$0.24	$0.48	$0.15

Note_16_Subsequent_Events_Deta

Note 16 - Subsequent Events (Details) (USD $)	0 Months Ended	12 Months Ended			2 Months Ended	0 Months Ended
	Jun. 18, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 25, 2015	Jan. 06, 2015	Jan. 07, 2015	Feb. 24, 2015	Feb. 18, 2014
			sqft
Note 16 - Subsequent Events (Details) [Line Items]
Business Combination, Consideration Transferred			$297,600,000
Area of Real Estate Property (in Square Feet)			1,000,000
Stock Issued During Period, Shares, New Issues (in Shares)	14,375,000
Proceeds from Issuance of Common Stock	205,500,000	214,906,251		37,811,658
2014 Sales Agreements ATM Program [Member] | Subsequent Event [Member] | Commissions Paid to Agent [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Payments of Stock Issuance Costs					67,000
2014 Sales Agreements ATM Program [Member] | Subsequent Event [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)					247,722
Proceeds from Issuance of Common Stock					4,500,000
2014 Sales Agreements ATM Program [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Stock Issued During Period, Shares, New Issues (in Shares)		0
Subsequent Event [Member] | Ontario Plaza [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Business Combination, Consideration Transferred						31,000,000
Subsequent Event [Member] | Tigard Marketplace Property [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Area of Real Estate Property (in Square Feet)						150,000
Subsequent Event [Member] | Park Oaks Shopping Center [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Business Combination, Consideration Transferred						47,700,000
Area of Real Estate Property (in Square Feet)						110,000
Subsequent Event [Member] | Winston Manor Shopping Center [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Business Combination, Consideration Transferred							20,500,000
Area of Real Estate Property (in Square Feet)							50,000
Subsequent Event [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Common Stock, Dividends, Per Share, Declared (in Dollars per share)								$0.17
Tigard Marketplace Property [Member]
Note 16 - Subsequent Events (Details) [Line Items]
Business Combination, Consideration Transferred									$25,100,000
Area of Real Estate Property (in Square Feet)									137,000

Schedule_III_Real_Estate_and_A2

Schedule III - Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
SEC Schedule III, Real Estate, Federal Income Tax Basis (in Dollars)	1.7
Building [Member] | Minimum [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Building [Member] | Maximum [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Building Improvements [Member] | Minimum [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building Improvements [Member] | Maximum [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
Property, Plant and Equipment, Useful Life	20 years

Schedule_III_Real_Estate_and_A3

Schedule III - Real Estate and Accumulated Depreciation (Details) - Real Estate and Accumulated Depreciation (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate Properties [Line Items]
Encumbrances	$91,467,553
Initial Cost to Company, Land	549,960,559
Initial Cost to Company, Building & Improvements	1,174,604,863
Cost Capitalized Subsequent to Acquisition, Land	117,591
Cost Capitalized Subsequent to Acquisition, Building & Improvements	61,215,293
Amount at Which Carried at Close of Period, Land	550,078,150
Amount at Which Carried at Close of Period, Building & Improvements	1,235,820,156
Total	1,785,898,306	[1]	1,372,433,648	871,693,595	580,832,410
Accumulated Depreciation	88,173,334	[2],[3]
Paramount Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,346,871
Initial Cost to Company, Building & Improvements	10,274,425
Cost Capitalized Subsequent to Acquisition, Land	94,202
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,300,527
Amount at Which Carried at Close of Period, Land	6,441,073
Amount at Which Carried at Close of Period, Building & Improvements	11,574,952
Total	18,016,025	[1]
Accumulated Depreciation	1,636,418	[2],[3]
Date of Acquisition	22-Dec-09	[1]
Santa Ana Downtown Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	7,895,272
Initial Cost to Company, Building & Improvements	9,890,440
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,013,833
Amount at Which Carried at Close of Period, Land	7,895,272
Amount at Which Carried at Close of Period, Building & Improvements	10,904,273
Total	18,799,545	[1]
Accumulated Depreciation	1,623,119	[2],[3]
Date of Acquisition	26-Jan-10	[1]
Meridian Valley Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	1,880,637
Initial Cost to Company, Building & Improvements	4,794,789
Cost Capitalized Subsequent to Acquisition, Building & Improvements	304,352
Amount at Which Carried at Close of Period, Land	1,880,637
Amount at Which Carried at Close of Period, Building & Improvements	5,099,141
Total	6,979,778	[1]
Accumulated Depreciation	857,027	[2],[3]
Date of Acquisition	1-Feb-10	[1]
The Market at Lake Stevens [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,086,933
Initial Cost to Company, Building & Improvements	12,397,178
Cost Capitalized Subsequent to Acquisition, Building & Improvements	28,045
Amount at Which Carried at Close of Period, Land	3,086,933
Amount at Which Carried at Close of Period, Building & Improvements	12,425,223
Total	15,512,156	[1]
Accumulated Depreciation	1,828,016	[2],[3]
Date of Acquisition	16-Mar-10	[1]
Norwood Shopping Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,031,309
Initial Cost to Company, Building & Improvements	11,534,239
Cost Capitalized Subsequent to Acquisition, Building & Improvements	616,789
Amount at Which Carried at Close of Period, Land	3,031,309
Amount at Which Carried at Close of Period, Building & Improvements	12,151,028
Total	15,182,337	[1]
Accumulated Depreciation	1,750,339	[2],[3]
Date of Acquisition	5-Apr-10	[1]
Pleasant Hill Marketplace [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,359,471
Initial Cost to Company, Building & Improvements	6,927,347
Cost Capitalized Subsequent to Acquisition, Building & Improvements	741,054
Amount at Which Carried at Close of Period, Land	6,359,471
Amount at Which Carried at Close of Period, Building & Improvements	7,668,401
Total	14,027,872	[1]
Accumulated Depreciation	1,251,013	[2],[3]
Date of Acquisition	8-Apr-10	[1]
Vancouver Market Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	4,080,212
Initial Cost to Company, Building & Improvements	6,912,155
Cost Capitalized Subsequent to Acquisition, Building & Improvements	417,874
Amount at Which Carried at Close of Period, Land	4,080,212
Amount at Which Carried at Close of Period, Building & Improvements	7,330,029
Total	11,410,241	[1]
Accumulated Depreciation	932,838	[2],[3]
Date of Acquisition	17-Jun-10	[1]
Happy Valley Town Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	11,678,257
Initial Cost to Company, Building & Improvements	27,011,054
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,658,102
Amount at Which Carried at Close of Period, Land	11,678,257
Amount at Which Carried at Close of Period, Building & Improvements	28,669,156
Total	40,347,413	[1]
Accumulated Depreciation	4,084,559	[2],[3]
Date of Acquisition	14-Jul-10	[1]
Cascade Summit [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,852,543
Initial Cost to Company, Building & Improvements	7,731,944
Cost Capitalized Subsequent to Acquisition, Building & Improvements	317,464
Amount at Which Carried at Close of Period, Land	8,852,543
Amount at Which Carried at Close of Period, Building & Improvements	8,049,408
Total	16,901,951	[1]
Accumulated Depreciation	1,298,293	[2],[3]
Date of Acquisition	20-Aug-10	[1]
Heritage Market Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,594,766
Initial Cost to Company, Building & Improvements	17,399,233
Cost Capitalized Subsequent to Acquisition, Building & Improvements	450,562
Amount at Which Carried at Close of Period, Land	6,594,766
Amount at Which Carried at Close of Period, Building & Improvements	17,849,795
Total	24,444,561	[1]
Accumulated Depreciation	2,345,418	[2],[3]
Date of Acquisition	23-Sep-10	[1]
Claremont Center [Member]
Real Estate Properties [Line Items]
Encumbrances		[4]
Initial Cost to Company, Land	5,975,391	[4]
Initial Cost to Company, Building & Improvements	1,018,505	[4]
Cost Capitalized Subsequent to Acquisition, Land	183,362	[4]
Cost Capitalized Subsequent to Acquisition, Building & Improvements	4,262,940	[4]
Amount at Which Carried at Close of Period, Land	6,158,753	[4]
Amount at Which Carried at Close of Period, Building & Improvements	5,281,445	[4]
Total	11,440,198	[1],[4]
Accumulated Depreciation	1,151,120	[2],[3],[4]
Date of Acquisition	23-Sep-10	[1],[4]
Shops At Sycamore Creek [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,747,011
Initial Cost to Company, Building & Improvements	11,583,858
Cost Capitalized Subsequent to Acquisition, Building & Improvements	818,932
Amount at Which Carried at Close of Period, Land	3,747,011
Amount at Which Carried at Close of Period, Building & Improvements	12,402,790
Total	16,149,801	[1]
Accumulated Depreciation	2,061,442	[2],[3]
Date of Acquisition	30-Sep-10	[1]
Gateway Village [Member]
Real Estate Properties [Line Items]
Encumbrances	7,270,256
Initial Cost to Company, Land	5,916,530
Initial Cost to Company, Building & Improvements	27,298,339
Cost Capitalized Subsequent to Acquisition, Building & Improvements	63,677
Amount at Which Carried at Close of Period, Land	5,916,530
Amount at Which Carried at Close of Period, Building & Improvements	27,362,016
Total	33,278,546	[1]
Accumulated Depreciation	3,220,700	[2],[3]
Date of Acquisition	16-Dec-10	[1]
Division Crossing [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,705,536
Initial Cost to Company, Building & Improvements	8,327,097
Cost Capitalized Subsequent to Acquisition, Building & Improvements	5,582,839
Amount at Which Carried at Close of Period, Land	3,705,536
Amount at Which Carried at Close of Period, Building & Improvements	13,909,936
Total	17,615,472	[1]
Accumulated Depreciation	1,300,209	[2],[3]
Date of Acquisition	22-Dec-10	[1]
Halsey Crossing [Member]
Real Estate Properties [Line Items]
Encumbrances		[4]
Initial Cost to Company, Land		[4]
Initial Cost to Company, Building & Improvements	7,773,472	[4]
Cost Capitalized Subsequent to Acquisition, Land		[4]
Cost Capitalized Subsequent to Acquisition, Building & Improvements	533,823	[4]
Amount at Which Carried at Close of Period, Land		[4]
Amount at Which Carried at Close of Period, Building & Improvements	8,307,295	[4]
Total	8,307,295	[1],[4]
Accumulated Depreciation	1,086,018	[2],[3],[4]
Date of Acquisition	22-Dec-10	[1],[4]
Marketplace Del Rio [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	13,420,202
Initial Cost to Company, Building & Improvements	22,251,180
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,180,925
Amount at Which Carried at Close of Period, Land	13,420,202
Amount at Which Carried at Close of Period, Building & Improvements	23,432,105
Total	36,852,307	[1]
Accumulated Depreciation	3,187,779	[2],[3]
Date of Acquisition	3-Jan-11	[1]
Pinole Vista [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	9,233,728
Initial Cost to Company, Building & Improvements	17,553,082
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,935,156
Amount at Which Carried at Close of Period, Land	9,233,728
Amount at Which Carried at Close of Period, Building & Improvements	19,488,238
Total	28,721,966	[1]
Accumulated Depreciation	2,694,503	[2],[3]
Date of Acquisition	6-Jan-11	[1]
Desert Spring Marketplace [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,517,225
Initial Cost to Company, Building & Improvements	18,761,350
Cost Capitalized Subsequent to Acquisition, Land	-159,973
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,368,969
Amount at Which Carried at Close of Period, Land	8,357,252
Amount at Which Carried at Close of Period, Building & Improvements	20,130,319
Total	28,487,571	[1]
Accumulated Depreciation	2,570,171	[2],[3]
Date of Acquisition	17-Feb-11	[1]
Mills Shopping Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	4,083,583
Initial Cost to Company, Building & Improvements	16,833,059
Cost Capitalized Subsequent to Acquisition, Building & Improvements	4,483,090
Amount at Which Carried at Close of Period, Land	4,083,583
Amount at Which Carried at Close of Period, Building & Improvements	21,316,149
Total	25,399,732	[1]
Accumulated Depreciation	2,820,007	[2],[3]
Date of Acquisition	17-Feb-11	[1]
Morada Ranch [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	2,503,605
Initial Cost to Company, Building & Improvements	19,546,783
Cost Capitalized Subsequent to Acquisition, Building & Improvements	344,846
Amount at Which Carried at Close of Period, Land	2,503,605
Amount at Which Carried at Close of Period, Building & Improvements	19,891,629
Total	22,395,234	[1]
Accumulated Depreciation	2,344,922	[2],[3]
Date of Acquisition	20-May-11	[1]
Renaissance [Member]
Real Estate Properties [Line Items]
Encumbrances	16,204,826
Initial Cost to Company, Land	8,640,261
Initial Cost to Company, Building & Improvements	13,848,388
Cost Capitalized Subsequent to Acquisition, Building & Improvements	453,255
Amount at Which Carried at Close of Period, Land	8,640,261
Amount at Which Carried at Close of Period, Building & Improvements	14,301,643
Total	22,941,904	[1]
Accumulated Depreciation	1,538,941	[2],[3]
Date of Acquisition	3-Aug-11	[1]
Country Club Gate [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,487,457
Initial Cost to Company, Building & Improvements	17,340,757
Cost Capitalized Subsequent to Acquisition, Building & Improvements	761,367
Amount at Which Carried at Close of Period, Land	6,487,457
Amount at Which Carried at Close of Period, Building & Improvements	18,102,124
Total	24,589,581	[1]
Accumulated Depreciation	2,057,986	[2],[3]
Date of Acquisition	8-Jul-11	[1]
Canyon Park [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	9,352,244
Initial Cost to Company, Building & Improvements	11,291,210
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,317,512
Amount at Which Carried at Close of Period, Land	9,352,244
Amount at Which Carried at Close of Period, Building & Improvements	12,608,722
Total	21,960,966	[1]
Accumulated Depreciation	1,829,222	[2],[3]
Date of Acquisition	29-Jul-11	[1]
Hawks Prairie [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,334,044
Initial Cost to Company, Building & Improvements	20,693,920
Cost Capitalized Subsequent to Acquisition, Building & Improvements	418,156
Amount at Which Carried at Close of Period, Land	5,334,044
Amount at Which Carried at Close of Period, Building & Improvements	21,112,076
Total	26,446,120	[1]
Accumulated Depreciation	2,344,695	[2],[3]
Date of Acquisition	8-Sep-11	[1]
Kress Building [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,692,748
Initial Cost to Company, Building & Improvements	20,866,133
Cost Capitalized Subsequent to Acquisition, Building & Improvements	4,411,012
Amount at Which Carried at Close of Period, Land	5,692,748
Amount at Which Carried at Close of Period, Building & Improvements	25,277,145
Total	30,969,893	[1]
Accumulated Depreciation	2,427,821	[2],[3]
Date of Acquisition	30-Sep-11	[1]
Round Hill Square [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,358,426
Initial Cost to Company, Building & Improvements	17,734,397
Cost Capitalized Subsequent to Acquisition, Building & Improvements	784,336
Amount at Which Carried at Close of Period, Land	6,358,426
Amount at Which Carried at Close of Period, Building & Improvements	18,518,733
Total	24,877,159	[1]
Accumulated Depreciation	2,003,528	[2],[3]
Date of Acquisition	23-Aug-11	[1]
Hillsboro [Member]
Real Estate Properties [Line Items]
Encumbrances		[4]
Initial Cost to Company, Land		[4]
Initial Cost to Company, Building & Improvements	18,054,929	[4]
Cost Capitalized Subsequent to Acquisition, Land		[4]
Cost Capitalized Subsequent to Acquisition, Building & Improvements	524,993	[4]
Amount at Which Carried at Close of Period, Land		[4]
Amount at Which Carried at Close of Period, Building & Improvements	18,579,922	[4]
Total	18,579,922	[1],[4]
Accumulated Depreciation	1,826,652	[2],[3],[4]
Date of Acquisition	23-Nov-11	[1],[4]
Gateway Shopping Center [Member]
Real Estate Properties [Line Items]
Encumbrances		[4]
Initial Cost to Company, Land	6,241,688	[4]
Initial Cost to Company, Building & Improvements	23,461,824	[4]
Cost Capitalized Subsequent to Acquisition, Land		[4]
Cost Capitalized Subsequent to Acquisition, Building & Improvements	36,902	[4]
Amount at Which Carried at Close of Period, Land	6,241,688	[4]
Amount at Which Carried at Close of Period, Building & Improvements	23,498,726	[4]
Total	29,740,414	[1],[4]
Accumulated Depreciation	2,027,163	[2],[3],[4]
Date of Acquisition	16-Feb-12	[1],[4]
Euclid Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	7,407,116
Initial Cost to Company, Building & Improvements	7,752,767
Cost Capitalized Subsequent to Acquisition, Building & Improvements	2,718,623
Amount at Which Carried at Close of Period, Land	7,407,116
Amount at Which Carried at Close of Period, Building & Improvements	10,471,390
Total	17,878,506	[1]
Accumulated Depreciation	1,052,527	[2],[3]
Date of Acquisition	28-Mar-12	[1]
Green Valley [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	1,684,718
Initial Cost to Company, Building & Improvements	8,999,134
Cost Capitalized Subsequent to Acquisition, Building & Improvements	259,758
Amount at Which Carried at Close of Period, Land	1,684,718
Amount at Which Carried at Close of Period, Building & Improvements	9,258,892
Total	10,943,610	[1]
Accumulated Depreciation	920,097	[2],[3]
Date of Acquisition	2-Apr-12	[1]
Aurora Square [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,002,147
Initial Cost to Company, Building & Improvements	1,692,681
Amount at Which Carried at Close of Period, Land	3,002,147
Amount at Which Carried at Close of Period, Building & Improvements	1,692,681
Total	4,694,828	[1]
Accumulated Depreciation	286,108	[2],[3]
Date of Acquisition	3-May-12	[1]
Marlin Cove [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	8,814,850
Initial Cost to Company, Building & Improvements	6,797,289
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,353,773
Amount at Which Carried at Close of Period, Land	8,814,850
Amount at Which Carried at Close of Period, Building & Improvements	8,151,062
Total	16,965,912	[1]
Accumulated Depreciation	776,448	[2],[3]
Date of Acquisition	4-May-12	[1]
Seabridge [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,098,187
Initial Cost to Company, Building & Improvements	17,164,319
Cost Capitalized Subsequent to Acquisition, Building & Improvements	540,926
Amount at Which Carried at Close of Period, Land	5,098,187
Amount at Which Carried at Close of Period, Building & Improvements	17,705,245
Total	22,803,432	[1]
Accumulated Depreciation	1,581,515	[2],[3]
Date of Acquisition	31-May-12	[1]
Novato [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,329,472
Initial Cost to Company, Building & Improvements	4,411,801
Cost Capitalized Subsequent to Acquisition, Building & Improvements	629,040
Amount at Which Carried at Close of Period, Land	5,329,472
Amount at Which Carried at Close of Period, Building & Improvements	5,040,841
Total	10,370,313	[1]
Accumulated Depreciation	364,275	[2],[3]
Date of Acquisition	24-Jul-12	[1]
Glendora [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,847,407
Initial Cost to Company, Building & Improvements	8,758,338
Cost Capitalized Subsequent to Acquisition, Building & Improvements	157,145
Amount at Which Carried at Close of Period, Land	5,847,407
Amount at Which Carried at Close of Period, Building & Improvements	8,915,483
Total	14,762,890	[1]
Accumulated Depreciation	808,081	[2],[3]
Date of Acquisition	1-Aug-12	[1]
Wilsonville [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	4,180,768
Initial Cost to Company, Building & Improvements	15,394,342
Cost Capitalized Subsequent to Acquisition, Building & Improvements	230,572
Amount at Which Carried at Close of Period, Land	4,180,768
Amount at Which Carried at Close of Period, Building & Improvements	15,624,914
Total	19,805,682	[1]
Accumulated Depreciation	1,183,988	[2],[3]
Date of Acquisition	1-Aug-12	[1]
Bay Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	5,454,140
Initial Cost to Company, Building & Improvements	14,857,031
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,023,146
Amount at Which Carried at Close of Period, Land	5,454,140
Amount at Which Carried at Close of Period, Building & Improvements	15,880,177
Total	21,334,317	[1]
Accumulated Depreciation	1,182,562	[2],[3]
Date of Acquisition	5-Oct-12	[1]
Santa Theresa [Member]
Real Estate Properties [Line Items]
Encumbrances	10,829,884
Initial Cost to Company, Land	14,964,975
Initial Cost to Company, Building & Improvements	17,162,039
Cost Capitalized Subsequent to Acquisition, Building & Improvements	2,031,796
Amount at Which Carried at Close of Period, Land	14,964,975
Amount at Which Carried at Close of Period, Building & Improvements	19,193,835
Total	34,158,810	[1]
Accumulated Depreciation	1,453,022	[2],[3]
Date of Acquisition	8-Nov-12	[1]
Cypress West [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	15,479,535
Initial Cost to Company, Building & Improvements	11,819,089
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,924,075
Amount at Which Carried at Close of Period, Land	15,479,535
Amount at Which Carried at Close of Period, Building & Improvements	13,743,164
Total	29,222,699	[1]
Accumulated Depreciation	938,737	[2],[3]
Date of Acquisition	7-Dec-12	[1]
Redondo Beach [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	16,241,947
Initial Cost to Company, Building & Improvements	13,624,837
Cost Capitalized Subsequent to Acquisition, Building & Improvements	84,973
Amount at Which Carried at Close of Period, Land	16,241,947
Amount at Which Carried at Close of Period, Building & Improvements	13,709,810
Total	29,951,757	[1]
Accumulated Depreciation	956,869	[2],[3]
Date of Acquisition	28-Dec-12	[1]
Harbor Place [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	16,506,423
Initial Cost to Company, Building & Improvements	10,527,092
Cost Capitalized Subsequent to Acquisition, Building & Improvements	333,180
Amount at Which Carried at Close of Period, Land	16,506,423
Amount at Which Carried at Close of Period, Building & Improvements	10,860,272
Total	27,366,695	[1]
Accumulated Depreciation	645,918	[2],[3]
Date of Acquisition	28-Dec-12	[1]
Diamond Bar Town Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	9,540,204
Initial Cost to Company, Building & Improvements	16,794,637
Cost Capitalized Subsequent to Acquisition, Building & Improvements	3,976,039
Amount at Which Carried at Close of Period, Land	9,540,204
Amount at Which Carried at Close of Period, Building & Improvements	20,770,676
Total	30,310,880	[1]
Accumulated Depreciation	1,159,965	[2],[3]
Date of Acquisition	1-Feb-13	[1]
Bernardo Heights [Member]
Real Estate Properties [Line Items]
Encumbrances	8,581,168
Initial Cost to Company, Land	3,191,950
Initial Cost to Company, Building & Improvements	8,939,685
Cost Capitalized Subsequent to Acquisition, Building & Improvements	51,868
Amount at Which Carried at Close of Period, Land	3,191,950
Amount at Which Carried at Close of Period, Building & Improvements	8,991,553
Total	12,183,503	[1]
Accumulated Depreciation	531,355	[2],[3]
Date of Acquisition	6-Feb-13	[1]
Canyon Crossing [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	7,940,521
Initial Cost to Company, Building & Improvements	24,659,249
Cost Capitalized Subsequent to Acquisition, Building & Improvements	2,311,882
Amount at Which Carried at Close of Period, Land	7,940,521
Amount at Which Carried at Close of Period, Building & Improvements	26,971,131
Total	34,911,652	[1]
Accumulated Depreciation	1,495,164	[2],[3]
Date of Acquisition	15-Apr-13	[1]
Diamond Hills [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	15,457,603
Initial Cost to Company, Building & Improvements	29,352,602
Cost Capitalized Subsequent to Acquisition, Building & Improvements	360,963
Amount at Which Carried at Close of Period, Land	15,457,603
Amount at Which Carried at Close of Period, Building & Improvements	29,713,565
Total	45,171,168	[1]
Accumulated Depreciation	1,707,176	[2],[3]
Date of Acquisition	22-Apr-13	[1]
Granada Shopping Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,673,036
Initial Cost to Company, Building & Improvements	13,459,155
Cost Capitalized Subsequent to Acquisition, Building & Improvements	62,418
Amount at Which Carried at Close of Period, Land	3,673,036
Amount at Which Carried at Close of Period, Building & Improvements	13,521,573
Total	17,194,609	[1]
Accumulated Depreciation	760,336	[2],[3]
Date of Acquisition	27-Jun-13	[1]
Hawthorne Crossings [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	10,382,740
Initial Cost to Company, Building & Improvements	29,277,254
Cost Capitalized Subsequent to Acquisition, Building & Improvements	270,950
Amount at Which Carried at Close of Period, Land	10,382,740
Amount at Which Carried at Close of Period, Building & Improvements	29,548,204
Total	39,930,944	[1]
Accumulated Depreciation	1,426,033	[2],[3]
Date of Acquisition	27-Jun-13	[1]
Robinwood [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	3,996,984
Initial Cost to Company, Building & Improvements	11,317,359
Cost Capitalized Subsequent to Acquisition, Building & Improvements	273,267
Amount at Which Carried at Close of Period, Land	3,996,984
Amount at Which Carried at Close of Period, Building & Improvements	11,590,626
Total	15,587,610	[1]
Accumulated Depreciation	520,197	[2],[3]
Date of Acquisition	23-Aug-13	[1]
Five Points Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	18,419,733
Initial Cost to Company, Building & Improvements	36,965,189
Cost Capitalized Subsequent to Acquisition, Building & Improvements	339,524
Amount at Which Carried at Close of Period, Land	18,419,733
Amount at Which Carried at Close of Period, Building & Improvements	37,304,713
Total	55,724,446	[1]
Accumulated Depreciation	1,346,888	[2],[3]
Date of Acquisition	27-Sep-13	[1]
Crossroads Shopping Center [Member]
Real Estate Properties [Line Items]
Encumbrances	48,581,419
Initial Cost to Company, Land	68,366,245
Initial Cost to Company, Building & Improvements	67,755,526
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,636,435
Amount at Which Carried at Close of Period, Land	68,366,245
Amount at Which Carried at Close of Period, Building & Improvements	69,391,961
Total	137,758,206	[1]
Accumulated Depreciation	3,100,476	[2],[3]
Date of Acquisition	27-Sep-13	[1]
Peninsula Marketplace [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	14,730,088
Initial Cost to Company, Building & Improvements	19,213,763
Cost Capitalized Subsequent to Acquisition, Building & Improvements	232,920
Amount at Which Carried at Close of Period, Land	14,730,088
Amount at Which Carried at Close of Period, Building & Improvements	19,446,683
Total	34,176,771	[1]
Accumulated Depreciation	770,754	[2],[3]
Date of Acquisition	1-Nov-13	[1]
Country Club Village [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	9,985,749
Initial Cost to Company, Building & Improvements	26,578,916
Cost Capitalized Subsequent to Acquisition, Building & Improvements	1,270,337
Amount at Which Carried at Close of Period, Land	9,985,749
Amount at Which Carried at Close of Period, Building & Improvements	27,849,253
Total	37,835,002	[1]
Accumulated Depreciation	1,065,833	[2],[3]
Date of Acquisition	26-Nov-13	[1]
Plaza de la Canada [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	10,351,028
Initial Cost to Company, Building & Improvements	24,819,026
Cost Capitalized Subsequent to Acquisition, Building & Improvements	331,346
Amount at Which Carried at Close of Period, Land	10,351,028
Amount at Which Carried at Close of Period, Building & Improvements	25,150,372
Total	35,501,400	[1]
Accumulated Depreciation	798,279	[2],[3]
Date of Acquisition	13-Dec-13	[1]
Tigard Marketplace [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	13,586,729
Initial Cost to Company, Building & Improvements	9,603,492
Cost Capitalized Subsequent to Acquisition, Building & Improvements	257,816
Amount at Which Carried at Close of Period, Land	13,586,729
Amount at Which Carried at Close of Period, Building & Improvements	9,861,308
Total	23,448,037	[1],[2]
Accumulated Depreciation	386,341	[1],[2],[3]
Date of Acquisition	18-Feb-14
Creekside Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	14,806,966
Initial Cost to Company, Building & Improvements	29,475,850
Cost Capitalized Subsequent to Acquisition, Building & Improvements	8,024
Amount at Which Carried at Close of Period, Land	14,806,966
Amount at Which Carried at Close of Period, Building & Improvements	29,483,874
Total	44,290,840	[1],[2]
Accumulated Depreciation	918,875	[1],[2],[3]
Date of Acquisition	28-Feb-14
North Park Plaza [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	13,592,522
Initial Cost to Company, Building & Improvements	17,733,266
Amount at Which Carried at Close of Period, Land	13,592,522
Amount at Which Carried at Close of Period, Building & Improvements	17,733,266
Total	31,325,788	[1],[2]
Accumulated Depreciation	355,356	[1],[2],[3]
Date of Acquisition	30-Apr-14
Aurora Square II [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	6,861,740
Initial Cost to Company, Building & Improvements	9,797,749
Cost Capitalized Subsequent to Acquisition, Building & Improvements	4,113
Amount at Which Carried at Close of Period, Land	6,861,740
Amount at Which Carried at Close of Period, Building & Improvements	9,801,862
Total	16,663,602	[1],[2]
Accumulated Depreciation	249,028	[1],[2],[3]
Date of Acquisition	22-May-14
Fallbrook Shopping Center [Member]
Real Estate Properties [Line Items]
Encumbrances		[4]
Initial Cost to Company, Land	21,232,016	[4]
Initial Cost to Company, Building & Improvements	186,197,471	[4]
Cost Capitalized Subsequent to Acquisition, Land		[4]
Cost Capitalized Subsequent to Acquisition, Building & Improvements	2,409,052	[4]
Amount at Which Carried at Close of Period, Land	21,232,016	[4]
Amount at Which Carried at Close of Period, Building & Improvements	188,606,523	[4]
Total	209,838,539	[1],[2],[4]
Accumulated Depreciation	3,200,972	[1],[2],[3],[4]
Date of Acquisition	13-Jun-14	[4]
Moorpark Town Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	7,062,639
Initial Cost to Company, Building & Improvements	19,693,955
Amount at Which Carried at Close of Period, Land	7,062,639
Amount at Which Carried at Close of Period, Building & Improvements	19,693,955
Total	26,756,594	[1],[2]
Accumulated Depreciation	44,277	[1],[2],[3]
Date of Acquisition	3-Dec-14
Mission Foothill Marketplace [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	11,414,592
Initial Cost to Company, Building & Improvements	17,782,506
Amount at Which Carried at Close of Period, Land	11,414,592
Amount at Which Carried at Close of Period, Building & Improvements	17,782,506
Total	29,197,098	[1],[2]
Accumulated Depreciation	38,956	[1],[2],[3]
Date of Acquisition	4-Dec-14
Wilsonville Town Center [Member]
Real Estate Properties [Line Items]
Initial Cost to Company, Land	10,339,839
Initial Cost to Company, Building & Improvements	27,116,367
Amount at Which Carried at Close of Period, Land	10,339,839
Amount at Which Carried at Close of Period, Building & Improvements	27,116,367
Total	37,456,206	[1],[2]
Accumulated Depreciation	$47,007	[1],[2],[3]
Date of Acquisition	11-Dec-14
[1]	RECONCILIATION OF REAL ESTATE - OWNED SUBJECT TO OPERATING LEASESYear Ended December 31,2014 2013 2012Balance at beginning of period: $ 1,372,433,648 $ 871,693,595 $ 580,832,410Property improvements during the year 27,514,974 19,513,924 12,264,027Properties acquired during the year 416,297,696 487,309,488 278,597,158Properties sold during the year (23,675,678) (6,083,359) -Assets written off during the year (6,672,334) - -Balance at end of period: $ 1,785,898,306 $ 1,372,433,648 $ 871,693,595
[2]	Depreciation and investments in building and improvements reflected in the consolidated statement of operations is calculated over the estimated useful life of the assets as follows:Building: 39-40 yearsProperty Improvements: 10-20 years
[3]	RECONCILIATION OF ACCUMULATED DEPRECIATIONYear Ended December 31,2014 2013 2012Balance at beginning of period: $ 57,499,980 $ 32,364,772 $ 14,451,032Depreciation expenses 38,890,425 25,653,359 17,913,740Properties sold during the year (2,081,460) (433,342) -Property assets fully depreciated and written off (6,135,611) (84,809) -Balance at end of period: $ 88,173,334 $ 57,499,980 $ 32,364,772
[4]	Property is subject to a ground lease.

Schedule_III_Real_Estate_and_A4

Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Real Estate b Owned Subject to Operating Leases (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Real Estate b Owned Subject to Operating Leases [Abstract]
Balance at beginning of period:	$1,372,433,648		$871,693,595	$580,832,410
Balance at end of period:	1,785,898,306	[1]	1,372,433,648	871,693,595
Property improvements during the year	27,514,974		19,513,924	12,264,027
Properties acquired during the year	416,297,696		487,309,488	278,597,158
Properties sold during the year	-23,675,678		-6,083,359
Assets written off during the year	($6,672,334)
[1]	RECONCILIATION OF REAL ESTATE - OWNED SUBJECT TO OPERATING LEASESYear Ended December 31,2014 2013 2012Balance at beginning of period: $ 1,372,433,648 $ 871,693,595 $ 580,832,410Property improvements during the year 27,514,974 19,513,924 12,264,027Properties acquired during the year 416,297,696 487,309,488 278,597,158Properties sold during the year (23,675,678) (6,083,359) -Assets written off during the year (6,672,334) - -Balance at end of period: $ 1,785,898,306 $ 1,372,433,648 $ 871,693,595

Schedule_III_Real_Estate_and_A5

Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Accumulated Depreciation (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Accumulated Depreciation [Abstract]
Balance at beginning of period:	$57,499,980	$32,364,772	$14,451,032
Depreciation expenses	38,890,425	25,653,359	17,913,740
Properties sold during the year	-2,081,460	-433,342
Property assets fully depreciated and written off	-6,135,611	-84,809
Balance at end of period:	$88,173,334	$57,499,980	$32,364,772

Schedule_IV_Mortgage_Loans_on_2

Schedule IV - Mortgage Loans on Real Estate (Details) - Reconciliation of Mortgage Loans on Real Estate (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule IV - Mortgage Loans on Real Estate (Details) - Reconciliation of Mortgage Loans on Real Estate [Line Items]
Balance at beginning of period:		$10,000,000	$10,000,000
Balance at end of period:		10,000,000	10,000,000
Eliminations from Consolidation of Joint Ventures [Member]
Schedule IV - Mortgage Loans on Real Estate (Details) - Reconciliation of Mortgage Loans on Real Estate [Line Items]
Mortgage loans eliminated upon consolidation of joint venture	($10,000,000)