RELATED PARTY MANAGEMENT SERVICES BUSINESS - General Information (Details)						12 Months Ended
	Feb. 16, 2023 USD ($) $ / shares	Jan. 07, 2022 USD ($) property	Dec. 10, 2021 USD ($)	Oct. 26, 2021 USD ($) $ / shares	Nov. 26, 2019 USD ($) property shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) property $ / shares shares	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Share purchased | shares						155,665
Purchase price of shares						$ 94,851,000		$ 513,000
Average price per share | $ / shares						$ 17.57
Investment in Alpine Income Property Trust, Inc.						$ 42,041,000	$ 41,037,000
Outstanding Principal						447,584,000
Gain (Loss) on Extinguishment of Debt							(3,431,000)	1,141,000
Revenues						82,320,000	70,272,000	56,381,000
Management Fee Income
Real Estate [Line Items]
Revenues						3,829,000	3,305,000	2,744,000
Common Stock [Member]
Real Estate [Line Items]
Purchase price of shares						48,000		10,000
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.						$ 42,041,000	41,037,000
Investment ownership percentage (as a percent)						14.60%
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					$ 23,300,000
Share purchased | shares						1,223,854
Investment in Alpine Income Property Trust, Inc.						$ 23,351,000	$ 24,526,000
Investment ownership percentage (as a percent)						8.10%
Common Stock [Member]
Real Estate [Line Items]
Share purchased | shares					421,053	979,543	8,088
Purchase price of shares					$ 8,000,000.0	$ 2,700,000	$ 100,000
Investment in Alpine Income Property Trust, Inc.						$ 18,690,000	16,511,000
Investment ownership percentage (as a percent)						6.50%
Mortgage Notes Payable Under CMBS Portfolio
Real Estate [Line Items]
Outstanding Principal		$ 30,000,000.0
Private placement
Real Estate [Line Items]
Share purchased | shares					394,737
Purchase price of shares					$ 7,500,000
2022 Acquisitions | Income Property Single Tenant
Real Estate [Line Items]
Number of real estate properties | property		1
Sales price		$ 6,900,000
Land JV
Real Estate [Line Items]
Management fee revenue earned						$ 0	100,000	200,000
Management fee revenue earned per month			$ 20,000			$ 20,000,000
Monthly management fee			$ 10,000				10,000,000
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						$ 0.00
Percentage of multiply factor						15.00%
Amount of incentive fee						$ 0	0
Management fee revenue earned						3,800,000	3,200,000	2,600,000
Proceeds from Dividends Received						$ 2,300,000	$ 2,100,000	$ 1,700,000
Alpine
Real Estate [Line Items]
Number of properties sold | property					15
Aggregate cash consideration					$ 125,900,000
Amount of shares authorized for purchase by the board	$ 2,100,000			$ 5,000,000.0
Average price per share | $ / shares	$ 18.50			$ 17.75			$ 17.65
Alpine | Mortgage Notes Payable Under CMBS Portfolio
Real Estate [Line Items]
Real estate acquired purchase price							$ 44,500,000
Number of real estate properties | property							6
Gain (Loss) on Extinguishment of Debt		$ 500,000
Alpine | Mortgage Notes Payable Under CMBS Portfolio | Income Property Single Tenant
Real Estate [Line Items]
Real estate acquired purchase price							$ 11,500,000
Number of real estate properties | property							1