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SUBSEQUENT EVENTS - Narrative (Details) - USD ($) |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 24, 2024 | Jan. 31, 2024 | Jan. 17, 2024 | Dec. 31, 2023
Subsequent Event [Line Items] |  |  |  |
Sale of stock, aggregate value of securities authorized |  |  |  | $ 300,000,000.0
Adviser | David Gladstone |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 100.00%
Adviser | Gladstone Companies, Inc |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 100.00%
The Gladstone Companies, Ltd | David Gladstone |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 100.00%
Gladstone Companies, Inc | The Gladstone Companies, Ltd |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 100.00%
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Sale of stock, aggregate value of securities authorized |  |  | $ 700,000,000 |
Subsequent Event | Adviser | David Gladstone |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  |  |
Subsequent Event | Adviser | Voting Trust Board |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Ownership percentage of voting rights | 20.00% |  |  |
Effective period after agreement is entered into | 1 year |  |  |
Subsequent Event | CHA Holdings, Inc. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Net proceeds from the sale of investments |  | $ 3,000,000 |  |

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