RELATED PARTY MANAGEMENT SERVICES BUSINESS - General Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended		46 Months Ended
	Nov. 26, 2019 USD ($) property shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) property $ / shares shares	Sep. 30, 2023 USD ($) shares	Feb. 16, 2023 USD ($)	Jan. 07, 2022 USD ($) property	Oct. 26, 2019 USD ($)
Real Estate [Line Items]
Investment in Alpine Income Property Trust, Inc.		$ 38,162		$ 38,162		$ 42,041		$ 38,162
Outstanding Principal		549,834		549,834				549,834
Revenues		28,470	$ 23,117	79,234	$ 59,790
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units [Member]
Real Estate [Line Items]
Investment in Alpine Income Property Trust, Inc.		$ 38,162		$ 38,162		$ 42,041		$ 38,162
Investment ownership percentage (as a percent)		15.10%		15.10%				15.10%
Alpine Income Property OP, LP Limited Partnership Units
Real Estate [Line Items]
Number of contributed properties | property	5
Aggregate of OP units | shares	1,223,854
Initial value	$ 23,300
Share purchased | shares				1,223,854				1,200,000
Investment ownership percentage (as a percent)		7.90%		7.90%				7.90%
Common Stock [Member]
Real Estate [Line Items]
Share purchased | shares	421,053	0		129,271		155,665	8,088	1,108,814
Purchase price of shares	$ 8,000			$ 2,100		$ 2,700	$ 100
Investment in Alpine Income Property Trust, Inc.		$ 18,140		$ 18,140		$ 18,690		$ 18,140
Investment ownership percentage (as a percent)		7.20%		7.20%				7.20%
Private placement
Real Estate [Line Items]
Share purchased | shares	394,737
Purchase price of shares	$ 7,500
2022 Acquisitions | Income Property Single Tenant
Real Estate [Line Items]
Number of real estate properties | property										1
Sales price										$ 6,900
Management Agreement PINE
Real Estate [Line Items]
Percentage of base management fee				0.375%
Management fee (as a percent)				1.50%
Percentage of cumulative annual hurdle rate				8.00%
Amount of threshold incentive fee				$ 0
Percentage of multiply factor				15.00%
Management fee revenue earned		$ 1,100	900	$ 3,300	2,800
Proceeds from Dividends Received		$ 600	$ 600	$ 1,900	$ 1,700
Alpine
Real Estate [Line Items]
Number of properties sold | property	15
Aggregate cash consideration	$ 125,900
Amount of shares authorized for purchase by the board									$ 2,100		$ 5,000
Average price per share | $ / shares				$ 16.21		$ 17.57	$ 17.65
Alpine | Mortgage Notes Payable Under CMBS Portfolio
Real Estate [Line Items]
Real estate acquired purchase price							$ 44,500
Number of real estate properties | property							6
Alpine | Mortgage Notes Payable Under CMBS Portfolio | Income Property Single Tenant
Real Estate [Line Items]
Real estate acquired purchase price							$ 11,500
Number of real estate properties | property							1
Investee | Alpine Income Property Trust, Inc. | Management Agreement PINE
Real Estate [Line Items]
Revenues						$ 0