Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Rental revenue	$ 280,924	$ 280,388	$ 291,263
Other income	3,176	3,726	3,777
Total revenues	284,100	284,114	295,040
Operating expenses
Property operating	44,439	41,050	43,662
Property taxes	33,663	33,288	32,388
Depreciation and amortization	92,929	97,731	97,559
General and administrative expenses	19,654	16,755	17,831
Other expense	860	843	1,405
Total operating expenses	191,545	189,667	192,845
Gain on sale of real estate	22,340	0	13,175
Operating income	114,895	94,447	115,370
Non-operating expenses
Interest expense and other finance expenses	(57,535)	(59,726)	(61,687)
Net income	57,360	34,721	53,683
Net income attributable to non-controlling interests	(3,852)	(2,707)	(4,839)
Net Income Attributable to Retail Opportunity Investments Corp.	$ 53,508	$ 32,014	$ 48,844
Earnings per share/unit - basic (in dollars per share)	$ 0.44	$ 0.27	$ 0.42
Earnings per share/unit - diluted (in dollars per share)	0.44	0.27	0.42
Dividends per share (in dollars per share)	$ 0.5100	$ 0.2000	$ 0.7880
Comprehensive income:
Net income	$ 57,360	$ 34,721	$ 53,683
Other comprehensive income (loss):
Unrealized swap derivative gain (loss) arising during the period	216	(9,925)	(7,348)
Reclassification adjustment for amortization of interest expense included in net income	5,894	4,572	(345)
Other comprehensive income (loss)	6,110	(5,353)	(7,693)
Comprehensive income	63,470	29,368	45,990
Comprehensive income attributable to non-controlling interests	(4,304)	(2,034)	(4,839)
Comprehensive income attributable to Retail Opportunity Investments Corp.	59,166	27,334	41,151
Retail Opportunity Investments Partnership L.P.
Revenues
Rental revenue	280,924	280,388	291,263
Other income	3,176	3,726	3,777
Total revenues	284,100	284,114	295,040
Operating expenses
Property operating	44,439	41,050	43,662
Property taxes	33,663	33,288	32,388
Depreciation and amortization	92,929	97,731	97,559
General and administrative expenses	19,654	16,755	17,831
Other expense	860	843	1,405
Total operating expenses	191,545	189,667	192,845
Gain on sale of real estate	22,340	0	13,175
Operating income	114,895	94,447	115,370
Non-operating expenses
Interest expense and other finance expenses	(57,535)	(59,726)	(61,687)
Net income	$ 57,360	$ 34,721	$ 53,683
Earnings per share/unit - basic (in dollars per share)	$ 0.44	$ 0.27	$ 0.42
Dividends per share (in dollars per share)	$ 0.5100	$ 0.2000	$ 0.7880
Comprehensive income:
Net income	$ 57,360	$ 34,721	$ 53,683
Other comprehensive income (loss):
Unrealized swap derivative gain (loss) arising during the period	216	(9,925)	(7,348)
Reclassification adjustment for amortization of interest expense included in net income	5,894	4,572	(345)
Other comprehensive income (loss)	6,110	(5,353)	(7,693)
Comprehensive income	$ 63,470	$ 29,368	$ 45,990