MANAGEMENT SERVICES BUSINESS - General Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended				61 Months Ended
	Jan. 07, 2022 USD ($) property	Nov. 26, 2019 USD ($) property shares	Sep. 30, 2023 shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) property $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) shares	Dec. 12, 2023 USD ($)	Feb. 16, 2023 USD ($)	Oct. 26, 2021 USD ($)
Real Estate
Share purchased | shares			0
Purchase price of shares						$ 94,851
Outstanding Principal				$ 520,834				$ 520,834
Investment in Alpine Income Property Trust, Inc.				39,666	$ 39,445			39,666
Mortgage Notes Payable Under CMBS Portfolio
Real Estate
Outstanding Principal	$ 30,000
2022 Acquisitions | Income Property Single Tenant
Real Estate
Number of real estate properties | property	1
Sales price	$ 6,900
Private placement
Real Estate
Share purchased | shares		394,737
Purchase price of shares		$ 7,500
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units
Real Estate
Investment in Alpine Income Property Trust, Inc.				$ 39,666	39,445			$ 39,666
Investment ownership percentage (as a percent)				14.80%				14.80%
Alpine Income Property OP, LP Limited Partnership Units
Real Estate
Number of contributed properties | property		5
Aggregate of OP units | shares		1,223,854
Initial value		$ 23,300
Share purchased | shares								1,223,854
Investment in Alpine Income Property Trust, Inc.				$ 20,549	$ 20,695			$ 20,549
Investment ownership percentage (as a percent)				7.70%				7.70%
Common Stock
Real Estate
Share purchased | shares		421,053		29,807	129,271	155,665	8,088	1,138,621
Purchase price of shares		$ 8,000		$ 400	$ 2,100	$ 2,700	$ 100
Investment in Alpine Income Property Trust, Inc.				$ 19,117	18,750			$ 19,117
Investment ownership percentage (as a percent)				7.10%				7.10%
Investee | Alpine Income Property Trust, Inc.
Real Estate
Incentive fee income				$ 0	0	0
Management Agreement PINE
Real Estate
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				$ 4,200	4,300	3,800
Dividends received				$ 2,600	$ 2,500	$ 2,300
Alpine
Real Estate
Number of properties sold | property		15
Aggregate cash consideration		$ 125,900
Amount of shares authorized for purchase by the board									$ 2,000	$ 2,100	$ 5,000
Average price per share | $ / shares				$ 14.97	$ 16.21	$ 17.57	$ 17.65
Alpine | Mortgage Notes Payable Under CMBS Portfolio
Real Estate
Number of real estate properties | property						6
Real estate acquired purchase price						$ 44,500
Gain (loss) on extinguishment of debt	$ (500)
Alpine | Mortgage Notes Payable Under CMBS Portfolio | Income Property Single Tenant
Real Estate
Number of real estate properties | property						1
Real estate acquired purchase price						$ 11,500
Management Fee Income
Real Estate
Revenue from Contract with Customer, Including Assessed Tax				$ 4,590	$ 4,388	$ 3,829
Management Fee Income | Portfolio Management Agreement
Real Estate
Revenue from Contract with Customer, Including Assessed Tax				300	300
Management Fee Income | Portfolio Management Agreement | Maximum
Real Estate
Revenue from Contract with Customer, Including Assessed Tax				100	$ 100
Management Fee Income | Asset Management Agreement
Real Estate
Revenue from Contract with Customer, Including Assessed Tax				$ 100