Consolidated Schedules of Investments (Parenthetical)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Schedule Of Investments [Line Items]
Percentage of not qualifying assets to total assets		15.00%		11.70%
Percentage of default interest		2.00%
Total Senior Secured Loans
Schedule Of Investments [Line Items]
Percentage of fair value of loans bear interest with floor rate		94.20%		92.50%
Total Senior Secured Loans | Floating Rate
Schedule Of Investments [Line Items]
Percentage of fair value of loans bear interest at floor rate		99.20%		98.90%
FinancialForce.com, Inc. | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				3.00%
Capital Markets | Pico Quantitative Trading, LLC | First Lien Term Loan | LIBOR(S)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				1.00%
Diversified Financial Services | Worldremit Group Limited (United Kingdom) | First Lien Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				3.00%
Internet Software & Services | MetricStream, Inc. | First Lien Incremental Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				3.25%
Internet Software & Services | Persado, Inc. | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				4.25%
Investments
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		179.10%		158.10%	[1],[2]
Equity Securities
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		3.20%		3.60%	[1],[2]
Restricted Securities
Schedule Of Investments [Line Items]
Investment companies owns percentage of net assets		2.90%		3.30%
Cash And Cash Equivalents
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		3.00%		3.60%	[1],[2]
Cash and Investment
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		182.10%		161.70%	[1],[2]
Limited Partnership/Limited Liability Company Interests | Marsico Holdings, LLC
Schedule Of Investments [Line Items]
Initial Acquisition Date		Nov. 28, 2007		Nov. 28, 2007
Warrants To Purchase Series C Preferred Stock | FinancialForce.com
Schedule Of Investments [Line Items]
Initial Acquisition Date		Jan. 30, 2019		Jan. 30, 2019
Warrants to Purchase Membership Units | Pico Quantitative Trading Holdings, LLC,
Schedule Of Investments [Line Items]
Initial Acquisition Date		Feb. 07, 2020		Feb. 07, 2020
Warrants To Purchase Series D Stock | Worldremit Group Limited (United Kingdom)
Schedule Of Investments [Line Items]
Initial Acquisition Date		Feb. 11, 2021		Feb. 11, 2021
Senior Secured Notes | Advanced Lighting Technologies, LLC
Schedule Of Investments [Line Items]
Initial Acquisition Date		Mar. 16, 2021		Mar. 16, 2021
Warrants To Purchase Preferred Series A1 Shares | Razor Group GmbH (Germany)
Schedule Of Investments [Line Items]
Initial Acquisition Date		Apr. 28, 2021		Apr. 28, 2021
Limited Partnership Interests | Stitch Holdings, L.P.
Schedule Of Investments [Line Items]
Initial Acquisition Date		Jul. 30, 2021		Jul. 30, 2021
Warrants To Purchase Series E Stock | Worldremit Group Limited (United Kingdom)
Schedule Of Investments [Line Items]
Initial Acquisition Date		Aug. 27, 2021		Aug. 27, 2021
Warrants To Purchase Preferred Series B Shares | MXP Prime Platform GmbH (SellerX) (Germany)
Schedule Of Investments [Line Items]
Initial Acquisition Date		Nov. 23, 2021
Warrants To Purchase Preferred Series B Shares | SellerX Germany GmbH & Co. Kg (Germany)
Schedule Of Investments [Line Items]
Initial Acquisition Date				Nov. 23, 2021
Preferred Stock
Schedule Of Investments [Line Items]
Percentage of investments in Non-accrual status at fair value		2.80%		4.20%
Percentage of investments in Non-accrual status at cost		11.80%		13.40%
Preferred Stock | Blackbird Holdco Inc
Schedule Of Investments [Line Items]
Initial Acquisition Date		Dec. 14, 2021		Dec. 14, 2021
Warrants to Purchase Common Stock | Elevate Brands Holdco Inc
Schedule Of Investments [Line Items]
Initial Acquisition Date		Mar. 14, 2022
Warrants to Purchase Common Stock | Grey Orange International Inc
Schedule Of Investments [Line Items]
Initial Acquisition Date		May 06, 2022
Warrants to Purchase Common Stock | PerchHQ LLC
Schedule Of Investments [Line Items]
Initial Acquisition Date		Sep. 30, 2022
Warrants to Purchase Preferred Stock | Elevate Brands Holdco Inc
Schedule Of Investments [Line Items]
Initial Acquisition Date		Mar. 14, 2022
Warrants To Purchase Series C Shares | Razor Group GmbH (Germany)
Schedule Of Investments [Line Items]
Initial Acquisition Date		Dec. 23, 2022
Debt Investments
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		175.90%		154.50%
Percentage of investments in Non-accrual status at fair value		2.80%		4.20%
Percentage of investments in Non-accrual status at cost		11.80%		13.40%
Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Term Loan
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		1.00%
Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Term Loan | SOFR(Q)
Schedule Of Investments [Line Items]
Interest rate, floor	[3],[4],[5]	1.50%
Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Term Loan | LIBOR(S)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.50%
Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Incremental Term Loan | SOFR(Q)
Schedule Of Investments [Line Items]
Interest rate, floor	[3],[4],[5]	1.50%
Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Incremental Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.50%
Debt Investments | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | First Lien Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		3.00%
Interest rate, floor		1.00%	[3],[4],[5],[7],[8]	1.00%	[1],[2],[6],[9],[10]
Debt Investments | Health Care Providers & Services | INH Buyer, Inc. (IMS Health) | First Lien Term Loan | SOFR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		1.50%
Debt Investments | Health Care Providers & Services | INH Buyer, Inc. (IMS Health) | First Lien Term Loan | LIBOR(S)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.00%
Debt Investments | Health Care Providers & Services | INH Buyer, Inc. (IMS Health) | First Lien Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Interest rate, floor	[3],[4],[5],[11]	1.00%
Debt Investments | Internet Software & Services | FinancialForce.com, Inc. | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			2.75%
Debt Investments | Internet Software & Services | MetricStream, Inc. | First Lien Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.00%
Debt Investments | Internet Software & Services | MetricStream, Inc. | First Lien Incremental Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.00%
Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Term Loan | SOFR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		6.575%
Interest rate, floor	[3],[4],[5]	1.80%
Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Delayed Draw Term Loan | SOFR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		6.575%
Interest rate, floor	[3],[4],[5],[12]	1.80%
Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6]			1.80%
Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Term Loan | SOFR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		3.00%
Interest rate, floor	[3],[4],[5],[7],[8]	1.00%
Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6],[9],[10]			1.00%
Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Delayed Draw Term Loan | SOFR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		3.00%
Interest rate, floor	[3],[4],[5],[7],[8]	1.00%
Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Interest rate, floor	[1],[2],[6],[9],[10]			1.00%
Debt Investments | Professional Services | RigUp, Inc. | First Lien Delayed Draw Term Loan | LIBOR(M)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		4.00%		3.50%
Interest rate, floor		1.50%	[3],[4],[5]	1.50%	[1],[2],[6]
Debt Investments | Software | Grey Orange Incorporated | First Lien Term Loan | SOFR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		3.75%
Interest rate, floor	[3],[4],[5]	1.00%
Debt Investments | Software | Grey Orange Incorporated | First Lien Delayed Draw Term Loan | SOFR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage		3.75%
Interest rate, floor	[3],[4],[5],[12]	1.00%
Debt Investments | IT Services | Puppet, Inc. | First Lien Term Loan | LIBOR(Q)
Schedule Of Investments [Line Items]
Investment instrument exit fee percentage				3.00%
Interest rate, floor	[1],[2],[6]			1.00%
Minimum | Total Senior Secured Loans | Floor Rate
Schedule Of Investments [Line Items]
Interest rate, floor		0.50%		0.25%
Maximum
Schedule Of Investments [Line Items]
Percentage of aggregate fair value of net assets		5.00%
Maximum | Total Senior Secured Loans | Floor Rate
Schedule Of Investments [Line Items]
Interest rate, floor		1.80%		2.75%

[1] As of December 31, 2021, the Company generally uses GICS codes to identify the industry groupings. This information is unaudited.

[2] Unless otherwise indicated, all investments are considered Level 3 in accordance with ASC Topic 820 (see Note 2).

[3] Approximately 99.2% of the fair value of total senior secured loans in the Company’s portfolio bear interest at a floating rate that may be determined by reference to the London Interbank Offered Rate (“LIBOR”), “L”, Secured Overnight Financing Rate (“SOFR”), “S”, or other base rate (commonly the Federal Funds Rate or the Prime Rate), “P”, at the borrower’s option. In addition, 94.2% of the fair value of such senior secured loans have floors of 0.50% to 1.80%. The borrower under a senior secured loan generally has the option to select from interest reset periods of one, two, three or six months and may alter that selection at the end of any reset period. The stated interest rate represents the weighted average interest rate at December 31, 2022 of all contracts within the specified loan facility. LIBOR and SOFR reset monthly (M), quarterly (Q) or semiannually (S).

[4] As of December 31, 2022, the Company generally uses Global Industry Classification Standard (“GICS”) codes to identify the industry groupings. This information is unaudited.

[5] Unless otherwise indicated, all investments are considered Level 3 in accordance with ASC Topic 820 (see Note 2).

[6] Approximately 98.9% of the fair value of total senior secured loans in the Company’s portfolio bear interest at a floating rate that may be determined by reference to the London Interbank Offered Rate (LIBOR), “L”, or other base rate (commonly the Federal Funds Rate or the Prime Rate), “P”, at the borrower’s option. In addition, 92.5% of the fair value of such senior secured loans have floors of 0.25% to 2.75%. The borrower under a senior secured loan generally has the option to select from interest reset periods of one, two, three or six months and may alter that selection at the end of any reset period. The stated interest rate represents the weighted average interest rate at December 31, 2021 of all contracts within the specified loan facility.

[7] Investments that the Company has determined are not “qualifying assets” under Section 55(a) of the 1940 Act. Under the 1940 Act, we may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of our total assets. The status of these assets under the 1940 Act may be subject to change. The Company monitors the status of these assets on an ongoing basis. As of December 31, 2022, approximately 15.0% of the total assets of the Company were not qualifying assets under Section 55(a) of the 1940 Act.

[8] Non-U.S. company or principal place of business outside the U.S.

[9] Investments that the Company has determined are not “qualifying assets” under Section 55(a) of the 1940 Act. Under the 1940 Act, we may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of our total assets. The status of these assets under the 1940 Act may be subject to change. The Company monitors the status of these assets on an ongoing basis. As of December 31, 2021, approximately 11.7% of the total assets of the Company were not qualifying assets under Section 55(a) of the 1940 Act.

[10] Non-U.S. company or principal place of business outside the U.S

[11] Interest may be paid in cash or payment-in-kind (“PIK”), or a combination thereof which is generally at the option of the borrower. PIK earned is included in the cost basis of the security. In accordance with the Company’s policy, PIK is recorded on an effective interest method.

[12] Position or associated portfolio company thereof has an unfunded commitment as of December 31, 2022 (see Note 9). Note that there may be additional unfunded positions which do not have a funded component at period end, and therefore are not displayed herein. Any negative balances represent unfunded commitments that were acquired and/or valued at a discount.