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RELATED PARTY MANAGEMENT SERVICES BUSINESS - General Information (Details) |  |  |  |  |  | 12 Months Ended
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Feb. 16, 2023 USD ($) $ / shares | Jan. 07, 2022 USD ($) property | Dec. 10, 2021 USD ($) | Oct. 26, 2021 USD ($) $ / shares | Nov. 26, 2019 USD ($) property shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) property $ / shares shares | Dec. 31, 2020 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |
Share purchased | shares |  |  |  |  |  | 155,665 |  |
Purchase price of shares |  |  |  |  |  | $ 94,851,000 |  | $ 513,000
Average price per share | $ / shares |  |  |  |  |  | $ 17.57 |  |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  |  | $ 42,041,000 | $ 41,037,000 |
Outstanding Principal |  |  |  |  |  | 447,584,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | (3,431,000) | 1,141,000
Revenues |  |  |  |  |  | 82,320,000 | 70,272,000 | 56,381,000
Management Fee Income |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 3,829,000 | 3,305,000 | 2,744,000
Common Stock [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Purchase price of shares |  |  |  |  |  | 48,000 |  | 10,000
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. |  |  |  |  |  | $ 42,041,000 | 41,037,000 |
Investment ownership percentage (as a percent) |  |  |  |  |  | 14.60% |  |
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 |  |  |  |  | $ 23,300,000 |  |  |
Share purchased | shares |  |  |  |  |  | 1,223,854 |  |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  |  | $ 23,351,000 | $ 24,526,000 |
Investment ownership percentage (as a percent) |  |  |  |  |  | 8.10% |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Share purchased | shares |  |  |  |  | 421,053 | 979,543 | 8,088 |
Purchase price of shares |  |  |  |  | $ 8,000,000.0 | $ 2,700,000 | $ 100,000 |
Investment in Alpine Income Property Trust, Inc. |  |  |  |  |  | $ 18,690,000 | 16,511,000 |
Investment ownership percentage (as a percent) |  |  |  |  |  | 6.50% |  |
Mortgage Notes Payable Under CMBS Portfolio |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Outstanding Principal |  | $ 30,000,000.0 |  |  |  |  |  |
Private placement |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Share purchased | shares |  |  |  |  | 394,737 |  |  |
Purchase price of shares |  |  |  |  | $ 7,500,000 |  |  |
2022 Acquisitions | Income Property Single Tenant |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of real estate properties | property |  | 1 |  |  |  |  |  |
Sales price |  | $ 6,900,000 |  |  |  |  |  |
Land JV |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Management fee revenue earned |  |  |  |  |  | $ 0 | 100,000 | 200,000
Management fee revenue earned per month |  |  | $ 20,000 |  |  | $ 20,000,000 |  |
Monthly management fee |  |  | $ 10,000 |  |  |  | 10,000,000 |
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 |  |  |  |  |  | $ 0.00 |  |
Percentage of multiply factor |  |  |  |  |  | 15.00% |  |
Amount of incentive fee |  |  |  |  |  | $ 0 | 0 |
Management fee revenue earned |  |  |  |  |  | 3,800,000 | 3,200,000 | 2,600,000
Proceeds from Dividends Received |  |  |  |  |  | $ 2,300,000 | $ 2,100,000 | $ 1,700,000
Alpine |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  | 15 |  |  |
Aggregate cash consideration |  |  |  |  | $ 125,900,000 |  |  |
Amount of shares authorized for purchase by the board | $ 2,100,000 |  |  | $ 5,000,000.0 |  |  |  |
Average price per share | $ / shares | $ 18.50 |  |  | $ 17.75 |  |  | $ 17.65 |
Alpine | Mortgage Notes Payable Under CMBS Portfolio |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Real estate acquired purchase price |  |  |  |  |  |  | $ 44,500,000 |
Number of real estate properties | property |  |  |  |  |  |  | 6 |
Gain (Loss) on Extinguishment of Debt |  | $ 500,000 |  |  |  |  |  |
Alpine | Mortgage Notes Payable Under CMBS Portfolio | Income Property Single Tenant |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Real estate acquired purchase price |  |  |  |  |  |  | $ 11,500,000 |
Number of real estate properties | property |  |  |  |  |  |  | 1 |

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