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MANAGEMENT SERVICES BUSINESS - General Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended			12 Months Ended			70 Months Ended
	Nov. 26, 2019 USD ($) property shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) shares	Oct. 21, 2025 USD ($)	Dec. 31, 2023 USD ($)	Dec. 12, 2023 USD ($)	Feb. 16, 2023 USD ($)	Oct. 26, 2021 USD ($)
Management Fee Income
MANAGEMENT SERVICES BUSINESS
Revenue		$ 1,176	$ 1,124	$ 3,601	$ 3,360
Management Fee Income \| Portfolio Management Agreement \| Maximum [Member]
MANAGEMENT SERVICES BUSINESS
Revenue		100	100	200	100
Management Fee Income \| Asset Management Agreement \| Maximum [Member]
MANAGEMENT SERVICES BUSINESS
Revenue		$ 100	100	100	100
Private Placement [Member]
MANAGEMENT SERVICES BUSINESS
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
MANAGEMENT SERVICES BUSINESS
Management fee revenue earned				$ 35,000
Investment ownership percentage (as a percent)		16.10%		16.10%						16.10%
Alpine Income Property OP, LP Limited Partnership Units
MANAGEMENT SERVICES BUSINESS
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)		8.00%		8.00%						8.00%
Common Stock
MANAGEMENT SERVICES BUSINESS
Share purchased \| shares	421,053			109,081		129,271	29,807	155,665	8,088	1,247,702
Purchase price of shares	$ 8,000			$ 1,600		$ 2,100	$ 400	$ 2,700	$ 100
Investment ownership percentage (as a percent)		8.10%		8.10%						8.10%
Investee \| Alpine Income Property Trust, Inc.
MANAGEMENT SERVICES BUSINESS
Incentive fee income							$ 0
Management Agreement PINE
MANAGEMENT SERVICES BUSINESS
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	1,100	$ 3,300	3,100
Dividends received		700	$ 700	2,100	$ 1,900
Alpine
MANAGEMENT SERVICES BUSINESS
Number of properties sold \| property	15
Aggregate cash consideration	$ 125,900
Amount of shares authorized for purchase by the board		$ 0		$ 0						$ 0	$ 3,000	$ 0	$ 2,000	$ 2,100	$ 5,000
Average price per share \| $ / shares				$ 14.24		$ 16.21	$ 14.97	$ 17.57	$ 17.65