COMMON STOCK AND EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021
Income Available to Common Shareholders:
Net Income (Loss) Attributable to Alpine Income Property Trust, Inc.	$ (837)	$ 9,770	$ 2,582	$ 24,858
Net Income Attributable to Alpine Income Property Trust, Inc. - Basic	(837)	9,770	2,582	24,858
Net Income Attributable to Alpine Income Property Trust, Inc. - Diluted	$ (837)	$ 9,770	$ 2,582	$ 24,858
Weighted Average Number of Common Shares Outstanding (in shares)	13,946,194	11,888,171	14,001,774	11,799,151
Common Shares Applicable to Stock
Weighted Average Number of Common Shares Applicable to OP Units using Treasury Stock Method (in shares)	1,703,494	1,703,494	1,703,494	1,703,494
Total Shares Applicable to Diluted Earnings Per Share (in shares)	15,649,688	13,591,665	15,705,268	13,502,645
Per Common Share Data:
Basic (in dollars per share)	$ (0.06)	$ 0.82	$ 0.18	$ 2.11
Diluted (in dollars per share)	$ (0.05)	$ 0.72	$ 0.16	$ 1.84
Partners' capital account, units issued					479,640
CTO
Per Common Share Data:
Partners' capital account, units issued			1,223,854