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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investments in and Advances to Affiliates [Line Items]          
Fair Value, beginning balance [1],[2],[3],[4]     $ 957,906    
Fair Value, ending balance $ 1,090,675 [5],[6],[7],[8]   1,090,675 [5],[6],[7],[8]   $ 957,906 [1],[2],[3],[4]
Net Change in Unrealized Appreciation (Depreciation) (4,568) $ (2,057) (5,406) $ (139)  
Control Investments          
Investments in and Advances to Affiliates [Line Items]          
Principal Amount - Debt Investments 5,226   5,226   5,226
Gross Additions         11,458
Gross Reductions         (11,458)
Net Realized Gain (Losses)         (11,458)
Net Change in Unrealized Appreciation (Depreciation)         11,083
Affiliate Investments          
Investments in and Advances to Affiliates [Line Items]          
Principal Amount - Debt Investments 24,602   24,602   24,602
Fair Value, beginning balance     83,876 101,590 101,590
Gross Additions     6,464   7,139
Gross Reductions     (4,513)   (24,853)
Fair Value, ending balance 85,827   85,827   83,876
Net Change in Unrealized Appreciation (Depreciation)     417   (8,395)
Interest Income     2,603   4,026
Dividend Income     1,830   519
Fee Income     15   65
EBL, LLC (EbLens) | Control Investments          
Investments in and Advances to Affiliates [Line Items]          
Gross Additions         11,458
Gross Reductions         (11,458)
Net Realized Gain (Losses)         (11,458)
Net Change in Unrealized Appreciation (Depreciation)         11,083
US GreenFiber, LLC | Control Investments          
Investments in and Advances to Affiliates [Line Items]          
Principal Amount - Debt Investments 5,226   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   9,602
Fair Value, beginning balance     24,590 23,168 23,168
Gross Additions     25   1,422
Fair Value, ending balance 24,615   24,615   24,590
Net Change in Unrealized Appreciation (Depreciation)     25   1,422
Interest Income     804   974
Medsurant Holdings, LLC | Affiliate Investments          
Investments in and Advances to Affiliates [Line Items]          
Fair Value, beginning balance     5,930 2,540 2,540
Gross Additions     4,576   3,463
Gross Reductions     (328)   (73)
Fair Value, ending balance 10,178   10,178   5,930
Net Change in Unrealized Appreciation (Depreciation)     4,576   3,463
Dividend Income     1,328    
Pfanstiehl, Inc | Affiliate Investments          
Investments in and Advances to Affiliates [Line Items]          
Fair Value, beginning balance     33,321 51,992 51,992
Gross Additions         46
Gross Reductions     (301)   (18,717)
Fair Value, ending balance 33,020   33,020   33,321
Net Change in Unrealized Appreciation (Depreciation)     (301)   (8,717)
Interest Income         673
Dividend Income     348   347
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   15,000
Fair Value, beginning balance     15,321 19,118 19,118
Gross Additions     1,863   2,208
Gross Reductions     (3,279)   (6,005)
Fair Value, ending balance 13,905   13,905   15,321
Net Change in Unrealized Appreciation (Depreciation)     (3,278)   (4,505)
Interest Income     1,799   2,379
Fee Income     15   65
Steward Holding LLC (dba Steward Advanced Materials) | Affiliate Investments          
Investments in and Advances to Affiliates [Line Items]          
Fair Value, beginning balance     4,714 $ 4,772 4,772
Gross Reductions     (605)   (58)
Fair Value, ending balance $ 4,109   4,109   4,714
Net Change in Unrealized Appreciation (Depreciation)     (605)   (58)
Dividend Income     $ 154   $ 172
[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] 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 September 30, 2024, the Company held restricted securities with an aggregate fair value of $1,090,675, or 166% 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.