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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