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Portfolio Company Investments - Schedule of Consolidated Schedule of Investments in and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance [1],[2],[3],[4] $ 860,329  
Fair Value, ending balance 957,906 [5],[6],[7],[8] $ 860,329 [1],[2],[3],[4]
Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 5,226 14,576
Fair Value, beginning balance   2,151
Gross Additions 11,458 20,174
Gross Reductions (11,458) (22,325)
Net Realized Gain (Losses) (11,458) (158)
Net Change in Unrealized Appreciation (Depreciation) 11,083 (13,233)
Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments 24,602 34,602
Fair Value, beginning balance 101,590 137,284
Gross Additions 7,139 70,477
Gross Reductions (24,853) (106,171)
Fair Value, ending balance 83,876 101,590
Net Realized Gain (Losses)   39,833
Net Change in Unrealized Appreciation (Depreciation) (8,395) (35,979)
Interest Income 4,026 3,464
Payment-in-kind Interest Income   30
Dividend Income 519 725
Fee Income 65 457
EBL, LLC (EbLens) | Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments   9,350
Gross Additions 11,458 19,628
Gross Reductions (11,458) (19,628)
Net Realized Gain (Losses) (11,458)  
Net Change in Unrealized Appreciation (Depreciation) 11,083 (11,083)
Hilco Plastics Holdings, LLC (dba Hilco Technologies) | Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Gross Additions   353
Gross Reductions   (353)
Net Realized Gain (Losses)   (352)
Mesa Line Services, LLC | Control Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance   2,151
Gross Additions   193
Gross Reductions   (2,344)
Net Realized Gain (Losses)   194
Net Change in Unrealized Appreciation (Depreciation)   (2,150)
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 23,168 22,405
Gross Additions 1,422 13,566
Gross Reductions   (12,803)
Fair Value, ending balance 24,590 23,168
Net Change in Unrealized Appreciation (Depreciation) 1,422 763
Interest Income 974 973
FAR Research Inc. | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance   28
Gross Reductions   (28)
Net Change in Unrealized Appreciation (Depreciation)   (28)
Medsurant Holdings, LLC | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 2,540 3,662
Gross Additions 3,463  
Gross Reductions (73) (1,122)
Fair Value, ending balance 5,930 2,540
Net Change in Unrealized Appreciation (Depreciation) 3,463 (1,122)
Mirage Trailers LLC | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance   10,675
Gross Additions   355
Gross Reductions   (11,030)
Net Realized Gain (Losses)   324
Net Change in Unrealized Appreciation (Depreciation)   (1,694)
Interest Income   248
Payment-in-kind Interest Income   29
Fee Income   132
Pfanstiehl, Inc | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Principal Amount - Debt Investments   10,000
Fair Value, beginning balance 51,992 57,639
Gross Additions 46 34,335
Gross Reductions (18,717) (39,982)
Fair Value, ending balance 33,321 51,992
Net Realized Gain (Losses)   24,330
Net Change in Unrealized Appreciation (Depreciation) (8,717) (15,432)
Interest Income 673 421
Dividend Income 347  
Fee Income   150
Pinnergy, Ltd. | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance   21,178
Gross Additions   15,300
Gross Reductions   (36,478)
Net Realized Gain (Losses)   15,300
Net Change in Unrealized Appreciation (Depreciation)   (18,177)
Dividend Income   656
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 19,118 18,359
Gross Additions 2,208 5,487
Gross Reductions (6,005) (4,728)
Fair Value, ending balance 15,321 19,118
Net Realized Gain (Losses)   (121)
Net Change in Unrealized Appreciation (Depreciation) (4,505) (1,723)
Interest Income 2,379 1,822
Fee Income 65 175
Steward Holding LLC (dba Steward Advanced Materials) | Affiliate Investments    
Investments in and Advances to Affiliates [Line Items]    
Fair Value, beginning balance 4,772 3,338
Gross Additions   1,434
Gross Reductions (58)  
Fair Value, ending balance 4,714 4,772
Net Change in Unrealized Appreciation (Depreciation) (58) 1,434
Payment-in-kind Interest Income   1
Dividend Income $ 172 $ 69
[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.
[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.