DESCRIPTION OF BUSINESS (Details) $ in Thousands, ft² in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) ft² property state a loan country	Dec. 31, 2022 USD ($)
Real Estate Properties
Number of commercial loan investment | loan	3
Investment in Alpine Income Property Trust, Inc. | $	$ 38,162	$ 42,041
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units
Real Estate Properties
Investment in Alpine Income Property Trust, Inc. | $	$ 38,162	$ 42,041
Investment ownership percentage (as a percent)	15.10%
Florida
Real Estate Properties
Number of states in which entity operates | country	19
Subsurface area of portfolio of mineral interests | a	352,000
Commercial
Real Estate Properties
Number of real estate properties	23
Number of states in which entity operates | state	9
Gross leasable space | ft²	4.1
Number of preferred equity investment	1
Single-tenant
Real Estate Properties
Number of real estate properties	7
Multi-tenant
Real Estate Properties
Number of real estate properties	16