ORGANIZATION AND OPERATIONS OF THE FUND (Details) - USD ($) |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
Jun. 30, 2017 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] | |||
| Investment Company, Regulated Status [true false] | true | ||
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | |
| Venture Lending & Leasing IX, LLC | |||
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] | |||
| Number of shares issued in sale (in shares) | 100,000 | ||
| Common stock, par value (in dollars per share) | $ 0.001 | ||
| Proceeds from purchase of shares | $ 25,000 | ||
| Venture Lending & Leasing IX, Inc. | Venture Lending & Leasing IX, LLC | |||
| Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] | |||
| Ownership percentage | 100.00% |