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Organization - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 03, 2021 | Mar. 04, 2020 | Dec. 04, 2019 | Feb. 11, 2014 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Aug. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |
Issuance of common shares | 453,985 | 113,500 | 113,500 |  | 0 | 453,985 | 0 |  |  |
Shares offering, price per share | $ 6.92 | $ 10.15 | $ 10.19 |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 14,391,775 | 14,385,810 |  |  |  |
Issuance of common shares |  |  |  |  | $ 0 | $ 3,141,576 | $ 0 |  |  |
Common stock, shares outstanding |  |  |  |  | 14,391,775 | 14,385,810 | 13,921,767 |  | 13,885,335 | 13,619,690
Repayment of debt percentage |  |  |  |  | 100.00% |  |  |  |  |
Qualifying assets percentage |  |  |  |  | 70.00% |  |  |  |  |
Amount of market capitalization |  |  |  |  | $ 250,000,000 |  |  |  |  |
Taxable subsidiaries |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
CM Finance LLC |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 6,000,000 |  |  |  |  |
Issuance of debt |  |  |  |  | $ 39,800,000 |  |  |  |  |
Stifel Venture Corp |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 2,181,818 |  |  |  |
Issuance of common shares |  |  |  |  | $ 32,700,000 |  |  |  |  |
Number of common stock shares repurchased |  |  |  |  | 2,181,818 |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 13,666,666 |  |  |  |  |
Investcorp Credit Management |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  | $ 0.001 |  |
Common stock, shares issued |  |  |  |  |  |  |  | 680,985 |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 680,985 |  |
IPO | Investcorp Credit Management | Common Stock |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.001 |  |  |  |  |  |
Issuance of common shares |  |  |  | 7,666,666 |  |  |  |  |  |
Shares offering, price per share |  |  |  | $ 15 |  |  |  |  |  |
Proceeds from initial public offering |  |  |  | $ 111,500,000 |  |  |  |  |  |

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