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SIGNIFICANT SUBSIDIARIES - Summarized Financial Information Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | --- | --- | --- | --- | ---
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |  |  |
Cost | $ 1,159,712 | [1],[2],[3],[4] |  |  | $ 938,303 | [5],[6],[7],[8] |  |  |  |
Total Investments | 1,150,046 | [1],[3],[9] |  |  | 936,614 | [5],[7],[10] |  |  |  |
Cash and cash equivalents | 21,686 |  |  |  | 11,431 |  |  |  |  |
Deferred financing costs and other assets | 3,996 |  |  |  | 4,038 |  |  |  |  |
Total assets | 1,202,157 |  |  |  | 973,957 |  |  |  |  |
Credit facility | 225,000 |  |  |  | 205,000 |  |  |  |  |
Other liabilities | 14,568 |  |  |  | 14,808 |  |  |  |  |
Total liabilities | 640,670 |  |  |  | 553,090 |  |  |  |  |
Total net assets | 561,487 |  | $ 475,724 | $ 452,985 | 420,867 |  | $ 387,337 | $ 381,945 | $ 368,095 | $ 336,251
Total liabilities and net assets | 1,202,157 |  |  |  | 973,957 |  |  |  |  |
I-45 SLF LLC |  |  |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |  |  |
Cost | 184,529 |  |  |  | 187,714 |  |  |  |  |
Total Investments | 160,998 |  |  |  | 176,704 |  |  |  |  |
Cash and cash equivalents | 2,794 |  |  |  | 9,949 |  |  |  |  |
Interest receivable | 1,343 |  |  |  | 850 |  |  |  |  |
Accounts receivable | 269 |  |  |  | 123 |  |  |  |  |
Deferred financing costs and other assets | 831 |  |  |  | 1,518 |  |  |  |  |
Total assets | 166,235 |  |  |  | 189,144 |  |  |  |  |
Credit facility | 104,000 |  |  |  | 114,500 |  |  |  |  |
Other liabilities | 2,654 |  |  |  | 2,596 |  |  |  |  |
Total liabilities | 106,654 |  |  |  | 117,096 |  |  |  |  |
Total net assets | 59,581 |  |  |  | 72,048 |  |  |  |  |
Total liabilities and net assets | $ 166,235 |  |  |  | $ 189,144 |  |  |  |  |
[1] | All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[2] | As of December 31, 2022, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $66.9 million; cumulative gross unrealized depreciation for federal income tax purposes was $66.7 million. Cumulative net unrealized appreciation was $0.2 million, based on a tax cost of $1,150.6 million.
[3] | Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[4] | Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.
[5] | All debt investments are income-producing, unless otherwise noted. Equity investments and warrants are non-income producing, unless otherwise noted.
[6] | As of March 31, 2022, the cumulative gross unrealized appreciation for U.S. federal income tax purposes is approximately $67.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $61.7 million. Cumulative net unrealized appreciation is $6.1 million, based on a tax cost of $852.4 million.
[7] | Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[8] | Represents amortized cost. Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.
[9] | The Company's investment portfolio is comprised entirely 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 readily 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. Refer to Note 4 - Fair Value Measurements for further discussion.
[10] | The Company's investment portfolio is comprised entirely 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 readily 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. Refer to Note 4 for further discussion.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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