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RELATED PARTY MANAGEMENT SERVICES BUSINESS - General Information (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 46 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 26, 2019 USD ($) property shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) property $ / shares shares | Sep. 30, 2023 USD ($) shares | Feb. 16, 2023 USD ($) | Jan. 07, 2022 USD ($) property | Oct. 26, 2019 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 38,162 |  | $ 38,162 |  | $ 42,041 |  | $ 38,162 |  |  |
Outstanding Principal |  | 549,834 |  | 549,834 |  |  |  | 549,834 |  |  |
Revenues |  | 28,470 | $ 23,117 | 79,234 | $ 59,790 |  |  |  |  |  |
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. |  | $ 38,162 |  | $ 38,162 |  | $ 42,041 |  | $ 38,162 |  |  |
Investment ownership percentage (as a percent) |  | 15.10% |  | 15.10% |  |  |  | 15.10% |  |  |
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 |  |  |  |  |  |  |  |  |  |
Share purchased | shares |  |  |  | 1,223,854 |  |  |  | 1,200,000 |  |  |
Investment ownership percentage (as a percent) |  | 7.90% |  | 7.90% |  |  |  | 7.90% |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share purchased | shares | 421,053 | 0 |  | 129,271 |  | 155,665 | 8,088 | 1,108,814 |  |  |
Purchase price of shares | $ 8,000 |  |  | $ 2,100 |  | $ 2,700 | $ 100 |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 18,140 |  | $ 18,140 |  | $ 18,690 |  | $ 18,140 |  |  |
Investment ownership percentage (as a percent) |  | 7.20% |  | 7.20% |  |  |  | 7.20% |  |  |
Private placement |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share purchased | shares | 394,737 |  |  |  |  |  |  |  |  |  |
Purchase price of shares | $ 7,500 |  |  |  |  |  |  |  |  |  |
2022 Acquisitions | Income Property Single Tenant |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  |  |  |  | 1 |
Sales price |  |  |  |  |  |  |  |  |  | $ 6,900 |
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 |  |  |  |  |  |  |
Percentage of multiply factor |  |  |  | 15.00% |  |  |  |  |  |  |
Management fee revenue earned |  | $ 1,100 | 900 | $ 3,300 | 2,800 |  |  |  |  |  |
Proceeds from Dividends Received |  | $ 600 | $ 600 | $ 1,900 | $ 1,700 |  |  |  |  |  |
Alpine |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 15 |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration | $ 125,900 |  |  |  |  |  |  |  |  |  |
Amount of shares authorized for purchase by the board |  |  |  |  |  |  |  |  | $ 2,100 |  | $ 5,000
Average price per share | $ / shares |  |  |  | $ 16.21 |  | $ 17.57 | $ 17.65 |  |  |  |
Alpine | Mortgage Notes Payable Under CMBS Portfolio |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate acquired purchase price |  |  |  |  |  |  | $ 44,500 |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  | 6 |  |  |  |
Alpine | Mortgage Notes Payable Under CMBS Portfolio | Income Property Single Tenant |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate acquired purchase price |  |  |  |  |  |  | $ 11,500 |  |  |  |
Number of real estate properties | property |  |  |  |  |  |  | 1 |  |  |  |
Investee | Alpine Income Property Trust, Inc. | Management Agreement PINE |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 0 |  |  |  |  |

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