INCOME PROPERTIES - Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) ft²	Mar. 31, 2021 USD ($) ft² property
Acquisitions of Income Properties
Weighted average amortization period of intangible assets	7 years 8 months 12 days
2022 Acquisitions
Acquisitions of Income Properties
Weighted average amortization period of intangible assets	5 years 8 months 12 days
2022 Acquisitions | Nonrecurring basis
Acquisitions of Income Properties
Land	$ 15,600
Buildings and improvements	17,900
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value	5,900
Intangible liabilities for below market lease value	200
2022 Acquisitions | Income Property, Multi-tenant, Katy, Texas [Member]
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs	$ 39,200
Property Square-Feet | ft²	205,813
Purchase Price	$ 39,100
Percentage Leased at Acquisition	95.00%
Remaining Lease Term at Acquisition Date (in years)	5 years 8 months 12 days
2022 Acquisitions | Income Property, Multi-tenant, Katy, Texas [Member] | Fixed-Rate Mortgage Note
Acquisitions of Income Properties
Aggregate outstanding principal balance	$ 17,800
2021 Acquisitions
Acquisitions of Income Properties
Number of real estate properties | property		2
Aggregate acquisition cost including capitalized acquisition costs		$ 38,600
Land		18,400
Buildings and improvements		14,300
Intangible assets pertaining to the in-place lease value, leasing fees and above market lease value		$ 5,900
Weighted average amortization period of intangible assets		7 years 7 months 6 days
Purchase Price		$ 38,500
2021 Acquisitions | Income Property, Multi-tenant, Jordan Landing, West Jordan, Utah
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 20,100
Property Square-Feet | ft²		170,996
Purchase Price		$ 20,000
Percentage Leased at Acquisition		100.00%
Remaining Lease Term at Acquisition Date (in years)		7 years 10 months 24 days
2021 Acquisitions | Income Property, Multi-tenant, Eastern Commons, Henderson, Nevada
Acquisitions of Income Properties
Aggregate acquisition cost including capitalized acquisition costs		$ 18,600
Property Square-Feet | ft²		133,304
Purchase Price		$ 18,500
Percentage Leased at Acquisition		96.00%
Remaining Lease Term at Acquisition Date (in years)		6 years 10 months 24 days