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MANAGEMENT SERVICES BUSINESS - General Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended	12 Months Ended			52 Months Ended
	Nov. 26, 2019 USD ($) property shares	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2024 USD ($) shares	Dec. 12, 2023 USD ($)	Feb. 16, 2023 USD ($)	Oct. 26, 2021 USD ($)
Real Estate
Outstanding Principal		$ 543,334						$ 543,334
Revenues		28,127	$ 24,717
Investment in Alpine Income Property Trust, Inc.		35,643			$ 39,445			$ 35,643
Management Fee Income
Real Estate
Revenues		1,105	1,098
Management Fee Income | Portfolio Management Agreement | Maximum
Real Estate
Revenues		100
Management Fee Income | Asset Management Agreement | Maximum
Real Estate
Revenues		$ 100
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 ownership percentage (as a percent)		8.20%						8.20%
Investment in Alpine Income Property Trust, Inc.		$ 18,701			20,695			$ 18,701
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units
Real Estate
Investment ownership percentage (as a percent)		15.70%						15.70%
Investment in Alpine Income Property Trust, Inc.		$ 35,643			39,445			$ 35,643
Common Stock
Real Estate
Share purchased | shares	421,053			129,271		155,665	8,088	1,108,814
Purchase price of shares	$ 8,000			$ 2,100		$ 2,700	$ 100
Investment ownership percentage (as a percent)		7.50%						7.50%
Investment in Alpine Income Property Trust, Inc.		$ 16,942			18,750			$ 16,942
Private placement
Real Estate
Share purchased | shares	394,737
Purchase price of shares	$ 7,500
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		$ 1,000	1,100
Dividends received		600	$ 600
Alpine
Real Estate
Number of properties sold | property	15
Aggregate cash consideration	$ 125,900
Amount of shares authorized for purchase by the board		$ 0			0			$ 0	$ 2,000	$ 2,100	$ 5,000
Average price per share | $ / shares				$ 16.21		$ 17.57	$ 17.65
Investee | Alpine Income Property Trust, Inc.
Real Estate
Incentive fee income					$ 0

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