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Portfolio Company Investments - Schedule of Consolidated Schedule of Investments in and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance [1],[2],[3],[4] $ 1,090,506  
Fair Value, ending balance 1,192,748 [5],[6],[7],[8] $ 1,090,506 [1],[2],[3],[4]
Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 5,226 5,226
Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 32,043 32,461
Fair Value, beginning balance 102,024 83,876
Gross Additions 18,496 21,441
Gross Reductions (23,215) (3,293)
Fair Value, ending balance 97,305 102,024
Net Realized Gain (Losses) 10,963  
Net Change in Unrealized Appreciation (Depreciation) (1,758) 7,954
Interest Income 3,258 3,533
Payment-in-kind Interest Income   9
Dividend Income 1,381 1,830
Fee Income 24 183
US GreenFiber, LLC | Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 5,226 5,226
Applegate Greenfiber Intermediate Inc. (fka US GreenFiber, LLC) | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 9,602 9,602
Fair Value, beginning balance 24,387 24,590
Gross Additions 1,270  
Gross Reductions   (203)
Fair Value, ending balance 25,657 24,387
Net Change in Unrealized Appreciation (Depreciation) 1,269 (202)
Interest Income 801 1,074
CP Communications, LLC | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 5,941 7,859
Fair Value, beginning balance 8,306  
Gross Additions 43 8,360
Gross Reductions (1,919) (54)
Fair Value, ending balance 6,430 8,306
Net Change in Unrealized Appreciation (Depreciation) 28  
Interest Income 794 88
Payment-in-kind Interest Income   9
Fee Income 8 163
Medsurant Holdings, LLC | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 9,863 5,930
Gross Additions 10,963 4,262
Gross Reductions (20,518) (329)
Fair Value, ending balance 308 9,863
Net Realized Gain (Losses) 10,963  
Net Change in Unrealized Appreciation (Depreciation) (6,981) 4,261
Dividend Income 867 1,328
Pfanstiehl, Inc | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 39,923 33,321
Gross Additions 1,999 6,602
Fair Value, ending balance 41,922 39,923
Net Change in Unrealized Appreciation (Depreciation) 1,999 6,602
Dividend Income 348 348
Spectra A&D Acquisition, Inc. (fka FDS Avionics Corp.) | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 16,500 15,000
Fair Value, beginning balance 14,921 15,321
Gross Additions 4,221 2,217
Gross Reductions   (2,617)
Fair Value, ending balance 19,142 14,921
Net Change in Unrealized Appreciation (Depreciation) 2,705 (2,617)
Interest Income 1,663 2,371
Fee Income 16 20
Steward Holding LLC (dba Steward Advanced Materials) | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 4,624 4,714
Gross Reductions (778) (90)
Fair Value, ending balance 3,846 4,624
Net Change in Unrealized Appreciation (Depreciation) (778) (90)
Dividend Income $ 166 $ 154
[1]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3]

(c) All debt investments are income producing, unless otherwise indicated.

Equity investments are non-income producing unless otherwise noted.
[4]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.
[5]

(a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[6]

(b) Equity ownership may be held in shares or units of companies related to the portfolio companies. The Company’s investments are generally classified as “restricted securities”, unless otherwise noted, as such term is defined under Regulation S-X Rule 6-03(f) or Securities Act Rule 144. As of September 30, 2025, the Company held restricted securities with an aggregate fair value of $1,192,748, or 168% of the Company's net assets.
[7]

(c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[8]

(g) Except as otherwise noted, the Company’s investment portfolio is comprised of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the board of directors, using significant unobservable Level 3 inputs.