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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, 2024
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 1,048,071 [5],[6],[7],[8] $ 957,906 [1],[2],[3],[4]
Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 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
Fair Value, beginning balance 83,876 101,590
Gross Additions 2,133 7,139
Gross Reductions (5,693) (24,853)
Fair Value, ending balance 80,316 83,876
Net Change in Unrealized Appreciation (Depreciation) (3,236) (8,395)
Interest Income 869 4,026
Dividend Income 348 519
Fee Income 5 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
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 24,590 23,168
Gross Additions 265 1,422
Fair Value, ending balance 24,855 24,590
Net Change in Unrealized Appreciation (Depreciation) 266 1,422
Interest Income 267 974
Medsurant Holdings, LLC | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 5,930 2,540
Gross Additions 1,863 3,463
Gross Reductions (329) (73)
Fair Value, ending balance 7,464 5,930
Net Change in Unrealized Appreciation (Depreciation) 1,863 3,463
Pfanstiehl, Inc | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 33,321 51,992
Gross Additions   46
Gross Reductions (3,608) (18,717)
Fair Value, ending balance 29,713 33,321
Net Change in Unrealized Appreciation (Depreciation) (3,608) (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
Fair Value, beginning balance 15,321 19,118
Gross Additions 5 2,208
Gross Reductions (1,447) (6,005)
Fair Value, ending balance 13,879 15,321
Net Change in Unrealized Appreciation (Depreciation) (1,448) (4,505)
Interest Income 602 2,379
Fee Income 5 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
Gross Reductions (309) (58)
Fair Value, ending balance 4,405 4,714
Net Change in Unrealized Appreciation (Depreciation) $ (309) (58)
Dividend Income   $ 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]

(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 March 31, 2024, the Company held restricted securities with an aggregate fair value of $1,047,818, or 172% 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.