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Portfolio Company Investments - Schedule of Consolidated Schedule of Investments in and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
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 1,154,408 [5],[6],[7],[8]   $ 1,090,506 [1],[2],[3],[4]
Net Change in Unrealized Appreciation (Depreciation) (9,793) $ 1,218  
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 30,952   32,461
Fair Value, beginning balance 102,024 83,876 83,876
Gross Additions 12,246   21,441
Gross Reductions (23,204)   (3,293)
Fair Value, ending balance 91,066   102,024
Net Realized Gain (Losses) 10,066    
Net Change in Unrealized Appreciation (Depreciation) (6,890)   7,954
Interest Income 1,094   3,533
Payment-in-kind Interest Income     9
Dividend Income 886   1,830
Fee Income 8   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 24,590
Gross Reductions (1,278)   (203)
Fair Value, ending balance 23,109   24,387
Net Change in Unrealized Appreciation (Depreciation) (1,278)   (202)
Interest Income 264   1,074
CP Communications, LLC | Affiliate Investments      
Investments in and Advances to Affiliates [Line Items]      
Principal Amount - Debt Investments 6,350   7,859
Fair Value, beginning balance 8,306    
Gross Additions 10   8,360
Gross Reductions (1,510)   (54)
Fair Value, ending balance 6,806   8,306
Interest Income 285   88
Payment-in-kind Interest Income     9
Fee Income 3   163
Medsurant Holdings, LLC | Affiliate Investments      
Investments in and Advances to Affiliates [Line Items]      
Fair Value, beginning balance 9,863 5,930 5,930
Gross Additions 10,066   4,262
Gross Reductions (19,558)   (329)
Fair Value, ending balance 371   9,863
Net Realized Gain (Losses) 10,066    
Net Change in Unrealized Appreciation (Depreciation) (6,918)   4,261
Dividend Income 538   1,328
Pfanstiehl, Inc | Affiliate Investments      
Investments in and Advances to Affiliates [Line Items]      
Fair Value, beginning balance 39,923 33,321 33,321
Gross Additions 2,165   6,602
Fair Value, ending balance 42,088   39,923
Net Change in Unrealized Appreciation (Depreciation) 2,165   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 15,000   15,000
Fair Value, beginning balance 14,921 15,321 15,321
Gross Additions 5   2,217
Gross Reductions (393)   (2,617)
Fair Value, ending balance 14,533   14,921
Net Change in Unrealized Appreciation (Depreciation) (394)   (2,617)
Interest Income 545   2,371
Fee Income 5   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 4,714
Gross Reductions (465)   (90)
Fair Value, ending balance 4,159   4,624
Net Change in Unrealized Appreciation (Depreciation) $ (465)   (90)
Dividend Income     $ 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. 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 December 31, 2024, the Company held restricted securities with an aggregate fair value of $1,090,506, or 166% of the Company's net assets.
[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] All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[6] 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 March 31, 2025, the Company held restricted securities with an aggregate fair value of $1,154,408, or 170% of the Company's net assets.
[7] 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.
[8] See Note 3 to the consolidated financial statements for portfolio composition by geographic location.