v3.26.1
FAIR VALUE MEASUREMENTS - Quantitative information (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 569,202 $ 578,649
Debt Investments    
FAIR VALUE MEASUREMENTS    
Investments, fair value 506,279 520,114
First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 413,701 429,573
Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 4,977 4,839
Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,345 1,286
Subordinated Notes    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,345 1,286
Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 86,256 84,416
Equity (excluding STRS JV)    
FAIR VALUE MEASUREMENTS    
Investments, fair value 62,923 58,535
Level 3    
FAIR VALUE MEASUREMENTS    
Investments, fair value 546,841 557,047
Level 3 | First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 413,701 429,573
Level 3 | First lien secured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 375,602 $ 358,708
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.028 0.079
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.151 0.335
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.104 0.112
Level 3 | First lien secured loans | Recent transaction    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 23,003 $ 51,846
Level 3 | First lien secured loans | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.98 0.968
Level 3 | First lien secured loans | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.993 0.996
Level 3 | First lien secured loans | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.984 0.983
Level 3 | First lien secured loans | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 15,096  
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 17,290
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.055 0.055
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.07 0.082
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.065 0.074
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 1,729
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.009
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.009
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.009
Level 3 | Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 4,977 $ 4,839
Level 3 | Second lien secured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 4,977 $ 3,404
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.093 0.095
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.156 0.095
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.113 0.095
Level 3 | Second lien secured loans | Recent transaction    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 1,435
Level 3 | Second lien secured loans | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.914
Level 3 | Second lien secured loans | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.914
Level 3 | Second lien secured loans | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.914
Level 3 | Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,345 $ 1,286
Level 3 | Subordinated unsecured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,345 $ 1,286
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.119 0.131
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.119 0.133
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.119 0.132
Level 3 | Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 86,256 $ 84,416
Level 3 | Subordinated Note to STRS JV | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value 86,256 84,416
Level 3 | Preferred Equity | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 9,230 $ 5,815
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.063 0.065
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.12 0.10
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.071 0.069
Level 3 | Common Equity | Recent transaction | Transaction price    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 95  
Level 3 | Common Equity | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 35.298  
Level 3 | Common Equity | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 35.298  
Level 3 | Common Equity | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 35.298  
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 21,708 $ 21,572
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.06 0.065
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.12 0.129
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.084 0.086
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 9,149 $ 9,144
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.024 0.009
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.024 0.023
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.024 0.023
Level 3 | Warrant | Option pricing model    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 204 $ 197
Level 3 | Warrant | Option pricing model | Volatility | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.33 0.27
Level 3 | Warrant | Option pricing model | Volatility | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.33 0.27
Level 3 | Warrant | Option pricing model | Volatility | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.33 0.27
Level 3 | Warrant | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 176 $ 205
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.063 0.074
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.063 0.074
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.063 0.074