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Borrowings - NMNLC Credit Facility II (Details) - USD ($)
$ in Thousands
 3 Months Ended 11 Months Ended
Nov. 01, 2022
Mar. 31, 2024
Mar. 31, 2023
Oct. 31, 2022
Dec. 31, 2023
Line of Credit Facility [Line Items]          
Amortization of financing costs   $ 1,985 $ 1,637    
NMNLC Credit Facility II          
Line of Credit Facility [Line Items]          
Credit facility outstanding balance   2,938     $ 2,853
Revolving Credit Facility | NMNLC Credit Facility II          
Line of Credit Facility [Line Items]          
Credit facility outstanding balance   2,938     $ 2,853
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility          
Line of Credit Facility [Line Items]          
Interest expense   45 53    
Non-usage fee   0 0    
Amortization of financing costs   $ 21 $ 23    
Weighted average interest rate   7.60% 7.20%    
Effective interest rate   11.40% 10.40%    
Average debt outstanding   $ 2,371 $ 2,973    
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC And NM CLFX LP          
Line of Credit Facility [Line Items]          
Maximum amount of borrowings available $ 27,500        
Credit facility outstanding balance   $ 25,493      
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | NMNLC          
Line of Credit Facility [Line Items]          
Commitment fee percentage on unused capacity       0.05%  
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | NMNLC And NM CLFX LP          
Line of Credit Facility [Line Items]          
Interest rate margin 2.25%        
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | SOFR | Minimum | NMNLC          
Line of Credit Facility [Line Items]          
Interest rate margin       0.35%