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Summary of Significant Accounting Policies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2012 | Mar. 31, 2024 USD ($) investment borrower | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) investment borrower
Accounting Policies [Abstract] |  |  |  |
Return of capital distributions |  | $ 0 | $ 0 |
Unamortized discounts and loan origination fees |  | 3,767,000 |  | $ 3,806,000
Upfront loan origination and closing fees received |  | $ 412,000 | 426,000 |
Number of borrowers with a loan or preferred equity securities on non-accrual status | borrower |  | 7 |  | 5
Fair value of the company's investments on non-accrual status |  | $ 10,768,000 |  | $ 7,456,000
Threshold minimum number of days for cash dividend to get automatically reinvested | 3 days |  |  |
Unamortized deferred financing costs |  | 2,908,000 |  | 3,235,000
Amortization of deferred financing costs |  | 327,000 | 321,000 |
Deferred offering costs |  | $ 262,000 |  | $ 262,000
Number of investments with foreign denomination | investment |  | 0 |  | 0
Excise tax accrued (in percent) |  | 4.00% |  |
Net expense (benefit) for U.S. federal excise tax |  | $ 11,000 | 155,000 |
Payables for excise taxes |  | 91,000 |  | $ 247,000
U.S. federal and state corporate-level income taxes, net tax expense |  | 7,000 | $ 78,000 |
Accrued income taxes |  | $ 0 |  | $ 0

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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