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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, 2022 | Dec. 31, 2021
Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Principal Amount - Debt Investments | $ 14,576 | $ 5,226
Fair Value, beginning balance | 2,151 | 28,253
Gross Additions | 20,174 | 41,485
Gross Reductions | (22,325) | (67,587)
Fair Value, ending balance |  | 2,151
Net Realized Gain (Losses) | (158) | 20,521
Net Change in Unrealized Appreciation (Depreciation) | (13,233) | 34
Interest Income |  | 3,735
Payment-in-kind Interest Income |  | 2,117
Dividend Income |  | 568
Fee Income |  | 1,872
Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Principal Amount - Debt Investments | 34,602 | 29,307
Fair Value, beginning balance | 137,284 | 81,394
Gross Additions | 70,477 | 72,005
Gross Reductions | (106,171) | (16,115)
Fair Value, ending balance | 101,590 | 137,284
Net Realized Gain (Losses) | 39,833 | 94
Net Change in Unrealized Appreciation (Depreciation) | (35,979) | 32,207
Interest Income | 3,464 | 2,695
Payment-in-kind Interest Income | 30 | 368
Dividend Income | 725 | 1,172
Fee Income | 457 | 385
EBL, LLC (EbLens) | Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Principal Amount - Debt Investments | 9,350 |
Gross Additions | 19,628 |
Gross Reductions | (19,628) |
Net Change in Unrealized Appreciation (Depreciation) | (11,083) |
Hilco Plastics Holdings, LLC (dba Hilco Technologies) | Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Gross Additions | 353 | 1,577
Gross Reductions | (353) | (1,577)
Net Realized Gain (Losses) | (352) | (881)
Interest Income |  | 308
Dividend Income |  | 568
Mesa Line Services, LLC | Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance | 2,151 |
Gross Additions | 193 | 32,708
Gross Reductions | (2,344) | (30,557)
Fair Value, ending balance |  | 2,151
Net Realized Gain (Losses) | 194 | 20,445
Net Change in Unrealized Appreciation (Depreciation) | (2,150) | 2,150
Interest Income |  | 951
Payment-in-kind Interest Income |  | 903
Fee Income |  | 1,472
US GreenFiber, LLC | Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Principal Amount - Debt Investments | 5,226 | 5,226
Fair Value, beginning balance |  | 20,862
Gross Additions |  | 5,214
Gross Reductions |  | (26,076)
Net Change in Unrealized Appreciation (Depreciation) |  | (3,144)
Interest Income |  | 2,386
Payment-in-kind Interest Income |  | 1,214
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 | 22,405 |
Gross Additions | 13,566 | 22,405
Gross Reductions | (12,803) |
Fair Value, ending balance | 23,168 | 22,405
Net Change in Unrealized Appreciation (Depreciation) | 763 |
Interest Income | 973 |
FAR Research Inc. | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance | 28 | 28
Gross Reductions | (28) |
Fair Value, ending balance |  | 28
Net Change in Unrealized Appreciation (Depreciation) | (28) |
Fiber Materials, Inc. | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance |  | 41
Gross Additions |  | 94
Gross Reductions |  | (135)
Net Realized Gain (Losses) |  | 94
Net Change in Unrealized Appreciation (Depreciation) |  | (42)
Medsurant Holdings, LLC | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance | 3,662 | 10,960
Gross Additions |  | 733
Gross Reductions | (1,122) | (8,031)
Fair Value, ending balance | 2,540 | 3,662
Net Change in Unrealized Appreciation (Depreciation) | (1,122) | 687
Interest Income |  | 331
Fee Income |  | 91
Mirage Trailers LLC | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Principal Amount - Debt Investments |  | 6,705
Fair Value, beginning balance | 10,675 | 6,494
Gross Additions | 355 | 4,225
Gross Reductions | (11,030) | (44)
Fair Value, ending balance |  | 10,675
Net Realized Gain (Losses) | 324 |
Net Change in Unrealized Appreciation (Depreciation) | (1,694) | 3,871
Interest Income | 248 | 761
Payment-in-kind Interest Income | 29 | 338
Dividend Income |  | 110
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 | 57,639 | 33,505
Gross Additions | 34,335 | 24,134
Gross Reductions | (39,982) |
Fair Value, ending balance | 51,992 | 57,639
Net Realized Gain (Losses) | 24,330 |
Net Change in Unrealized Appreciation (Depreciation) | (15,432) | 24,135
Interest Income | 421 |
Dividend Income |  | 1,062
Fee Income | 150 |
Pinnergy, Ltd. | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance | 21,178 | 20,589
Gross Additions | 15,300 | 589
Gross Reductions | (36,478) |
Fair Value, ending balance |  | 21,178
Net Realized Gain (Losses) | 15,300 |
Net Change in Unrealized Appreciation (Depreciation) | (18,177) | 589
Dividend Income | 656 |
Spectra A&D Acquisition, Inc. (fka FDS Avionics Corp.) | Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance |  | 7,391
Gross Additions |  | 1,986
Gross Reductions |  | (9,377)
Net Realized Gain (Losses) |  | 957
Net Change in Unrealized Appreciation (Depreciation) |  | 1,028
Interest Income |  | 90
Fee Income |  | 400
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 | 13,000
Fair Value, beginning balance | 18,359 |
Gross Additions | 5,487 | 18,452
Gross Reductions | (4,728) | (93)
Fair Value, ending balance | 19,118 | 18,359
Net Realized Gain (Losses) | (121) |
Net Change in Unrealized Appreciation (Depreciation) | (1,723) | 1,626
Interest Income | 1,822 | 1,142
Fee Income | 175 | 294
Steward Holding LLC (dba Steward Advanced Materials) | Affiliate Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Fair Value, beginning balance | 3,338 | 9,777
Gross Additions | 1,434 | 1,373
Gross Reductions |  | (7,812)
Fair Value, ending balance | 4,772 | 3,338
Net Change in Unrealized Appreciation (Depreciation) | 1,434 | 1,341
Interest Income |  | 461
Payment-in-kind Interest Income | 1 | $ 30
Dividend Income | $ 69 |

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