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SLR Senior Lending Program LLC - Summary financial information for SSLP (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Condensed Financial Statements, Captions [Line Items]          
Investments at fair value (cost $182,626 and $180,681, respectively) $ 2,099,331   $ 2,099,331   $ 2,124,812
Total assets 2,560,035   2,560,035   2,572,564
Debt outstanding ($94,100 and $94,500 face amounts, respectively, reported net of unamortized debt issuance costs of $1,651 and $1,843, respectively) 1,153,686   1,153,686   1,146,354
Total liabilities 1,577,928   1,577,928   1,576,571
Interest and other credit facility expenses 16,784 $ 16,742 33,166 $ 32,582  
Other general and administrative expenses 1,081 922 2,461 1,757  
Total expenses 31,075 32,324 62,526 63,399  
Net investment income 17,761 21,609 35,611 43,714  
Realized gain on investments (152) 235 (179) (187)  
Net change in unrealized gain (loss) on investments (9,340) 2,388 (10,039) 631  
Net realized and unrealized gain (loss) on investments and cash equivalents (9,492) 2,623 (10,218) 444  
Net increase in net assets resulting from operations 8,269 24,232 25,393 44,158  
SLR Senior Lending Program LLC [Member]          
Condensed Financial Statements, Captions [Line Items]          
Investments at fair value (cost $182,626 and $180,681, respectively) 180,864 [1]   180,864 [1]   181,369 [2]
Cash and other assets 10,124   10,124   11,441
Total assets 190,988   190,988   192,810
Debt outstanding ($94,100 and $94,500 face amounts, respectively, reported net of unamortized debt issuance costs of $1,651 and $1,843, respectively) 92,449   92,449   92,657
Distributions payable 2,485   2,485   1,885
Interest payable and other credit facility related expenses 1,500   1,500   1,488
Accrued expenses and other payables 291   291   268
Total liabilities 96,725   96,725   96,298
Members' equity 94,263   94,263   96,512
Total liabilities and members' equity 190,988   190,988   $ 192,810
Interest and miscellaneous income 4,312 4,558 8,724 9,027  
Service fees [3] 115 109 230 214  
Interest and other credit facility expenses 1,589 2,248 3,120 4,490  
Other general and administrative expenses 51 61 103 132  
Total expenses 1,755 2,418 3,453 4,836  
Net investment income 2,557 2,140 5,271 4,191  
Realized gain on investments 0 14 0 337  
Net change in unrealized gain (loss) on investments (1,687) (59) (2,450) (344)  
Net realized and unrealized gain (loss) on investments and cash equivalents (1,687) (45) (2,450) (7)  
Net increase in net assets resulting from operations $ 870 $ 2,095 $ 2,821 $ 4,184  
[1] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.
[2] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.
[3]

* Service fees are included within the Company’s Consolidated Statements of Operations as other income.