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Borrowings - Additional Information (Details) - USD ($)									12 Months Ended
	Nov. 18, 2022	Aug. 23, 2021	Mar. 31, 2021	Mar. 26, 2021	Sep. 30, 2020	Apr. 15, 2020	Nov. 30, 2019	Jul. 31, 2018	Jun. 30, 2023	Jun. 30, 2022	Dec. 04, 2021	Dec. 04, 2020	Jun. 14, 2023	Dec. 05, 2021	Jun. 21, 2019	Nov. 20, 2017
Debt Instrument [Line Items]
Revolving credit facility									$ 71,900,000	$ 84,000,000
Total borrowings									136,900,000
Redeemed principal amount									2,000
Revolving Financing Facility
Debt Instrument [Line Items]
Debt Outstanding Amount									0	0
London Interbank Offered Rates (LIBOR) [Member]
Debt Instrument [Line Items]
Borrowings interest rate spread (percent)												3.55%
Bore interest rate per annum					3.15%
Fee Paid on Undrawn Amounts					0.75%
Term Financing
Debt Instrument [Line Items]
Borrowings under the Term Financing						$ 102,000,000
Repayments of Debt						$ 20,000,000
Debt Outstanding Amount									0	0
Term Financing | London Interbank Offered Rates (LIBOR) [Member]
Debt Instrument [Line Items]
Borrowings interest rate spread (percent)											3.15%
Term Financing | Related Party [Member]
Debt Instrument [Line Items]
Other Liabilities														$ 122,000,000
Capital One Revolving Finance
Debt Instrument [Line Items]
Revolving credit facility																$ 50,000,000
Line of Credit Facility, remaining borrowing capacity					$ 20,000,000										$ 30,000,000
Debt Instrument, maturity date		Aug. 22, 2026			Dec. 05, 2021
Secured revolving credit facility		$ 115,000,000											$ 100,000,000
Debt Outstanding Amount									71,900,000	84,000,000
Reinvestment period		3 years
Amortization Period		2 years
Debt Instrument, unused borrowing capacity, description	The Capital One Revolving Financing required the payment of an upfront fee of 1.125% ($1.3 million) of the available borrowings under the Capital One Revolving Financing at the closing, and requires the payment of an unused fee of (i) 0.75% annually for any undrawn amounts below 50% of the Capital One Revolving Financing, (ii) 0.50% annually for any undrawn amounts between 50% and 75% of the Capital One Revolving Financing, and (iii) 0.25% annually for any undrawn amounts above 75% of the Capital One Revolving Financing. Borrowings under the Capital One Revolving Financing are based on a borrowing base.
Derivative, notional amount									188,600,000
Investments at Fair Value									183,500,000
Accrued Interest Receivable									0
Cash held by trustee									6,600,000
Capital One Revolving Finance | Fair Value, Inputs, Level 3
Debt Instrument [Line Items]
Total borrowings									71,900,000	84,000,000
Capital One Revolving Finance | SPV LLC [Member]
Debt Instrument [Line Items]
Derivative, notional amount									194,000,000
Investments at Fair Value									181,500,000
Cash held by trustee									8,100,000
Weighted average outstanding balance									$ 80,400,000	$ 101,400,000
Weighted average interest rate									5.95%	3.03%
Capital One Revolving Finance | SOFR [Member]
Debt Instrument [Line Items]
Borrowings interest rate spread (percent)	2.50%
Payment of an upfront fee	$ 1,300,000
Debt instrument, interest rate during period	2.00%
2026 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, maturity date			Apr. 01, 2026
Debt instrument, interest rate during period									5.21%
Proceeds from initial public offering			$ 65,000,000
Debt instrument interest rate			4.875%
Payments for underwriting expense			$ 1,300,000
Proceeds from sale of notes			63,100,000
Offering expense			$ 215,000
Aggregate principal amount									$ 65,000,000
Debt instrument, interest rate, stated percentage			4.875%
Debt instrument, description of variable rate basis									(1) 100% of the principal amount of the 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the 2026 Notes to be redeemed, discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 50 basis points; provided
Debt instrument, redemption price, percentage									100.00%
Redeemed principal amount									$ 64,800,000
2026 Notes [Member] | Minimum
Debt Instrument [Line Items]
Redemption notice period									30 days
2026 Notes [Member] | Maximum
Debt Instrument [Line Items]
Redemption notice period									60 days
2026 Notes [Member] | Fair Value, Inputs, Level 3
Debt Instrument [Line Items]
Long-term debt, fair value									$ 58,200,000
2023 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, maturity date									Jul. 01, 2023
Principal amount conversion price				$ 25
Schedule to mature									The 2023 Notes were scheduled to mature on July 1, 2023 and bore interest at a rate of 6.125%
Redeemed amount of debt instrument				$ 51,375,000
Redeemed date				Apr. 25, 2021
Debt instrument interest rate								6.125%	6.125%
Proceeds from sale of notes							$ 16,400,000	$ 33,200,000
Aggregate principal amount							$ 16,875,000	$ 34,500,000
Debt instrument, interest rate, stated percentage								6.125%	6.125%
Debt instrument, redemption price, percentage				100.00%

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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-Name Accounting Standards Codification
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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Description of unused borrowing capacity under the debt instrument and conditions under which the commitment can be withdrawn by the lender.

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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Nominal or face amount used to calculate payment on derivative.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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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.

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X

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Average amount borrowed under the credit facility during the period.

+ References

No definition available.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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X

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Amount of liabilities classified as other.

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-Subparagraph (SX 210.9-03.15)
-Publisher FASB
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Balance Type:	credit
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- Definition

Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

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X

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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-SubTopic 10
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-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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-Topic 230
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-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

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- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

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-Subparagraph (b)
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-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

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Balance Type:	credit
Period Type:	instant

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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-Paragraph (b)
-Subparagraph (1)
-Publisher SEC

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