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Note 7 - Borrowings (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 24, 2023
Feb. 25, 2022
Apr. 21, 2020
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 29, 2023
Dec. 31, 2022
Nov. 09, 2022
Jun. 15, 2022
Mar. 30, 2021
Aug. 13, 2019
Asset Coverage to Borrowings, Ratio, Percent           179.00%              
Restricted Investments       $ 2,838   $ 2,838     $ 2,788        
Long-Term Debt, Gross       439,696   439,696     439,323        
Debt Instrument, Face Amount       $ 633,696   $ 633,696     582,573        
Key Facility [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity, Accordian Feature               $ 150,000          
Line of Credit Facility, Maximum Borrowing Capacity               $ 300,000          
Line of Credit Facility, Advance Rate of Eligible Debt Investments               60.00%          
Long-Term Debt, Weighted Average Interest Rate, over Time       8.68% 5.60% 8.34% 4.75%            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.50%                  
Line of Credit Facility, Current Borrowing Capacity       $ 125,000   $ 125,000     120,000        
Line of Credit Facility, Remaining Borrowing Capacity       38,300   38,300     40,200        
Long-Term Debt, Gross       25,000   25,000     5,000        
Debt Instrument, Face Amount       $ 150,000   $ 150,000     $ 125,000        
Key Facility [Member] | Prime Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate       0.25%                  
Debt Instrument, Variable Rate       8.50%   8.50%     7.50%        
NYL Facility [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000   $ 100,000                    
Line of Credit Facility, Current Borrowing Capacity       $ 69,000   $ 69,000     $ 23,200        
Line of Credit Facility, Remaining Borrowing Capacity       5,100   5,100     23,200        
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature     $ 200,000                    
Line of Credit Facility, Advance Rate     67.00%                    
Line of Credit Facility, Change in Maximum Borrowing Capacity $ 50,000 $ 100,000                      
Debt Instrument, Interest Rate, Stated Percentage 4.60%                        
Long-Term Line of Credit       $ 181,000   $ 181,000     $ 176,800        
Line of Credit Facility, Interest Rate at Period End       5.85%   5.85%     5.57%        
Restricted Investments       $ 1,300   $ 1,300     $ 1,000        
Long-Term Debt, Gross       181,000   181,000     176,750        
Debt Instrument, Face Amount       250,000   250,000     200,000        
NYL Facility [Member] | USD Mid-market Swap Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate   3.00%                      
NYL Facility [Member] | Three Year I Curve [Member]                          
Debt Instrument, Basis Spread on Variable Rate 3.50%                        
Asset-backed Notes 2019 [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                         4.21%
Restricted Investments       400   400     600        
Long-Term Debt, Gross       18,696   18,696     42,573        
Debt Instrument, Face Amount       18,696   18,696     42,573       $ 160,000
Asset-backed Notes 2022 [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                   7.56%      
Restricted Investments       1,200   1,200              
Long-Term Debt, Gross       100,000   100,000     100,000        
Debt Instrument, Face Amount       100,000   100,000     100,000 $ 157,800      
The 2026 Notes [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                       4.875%  
Long-Term Debt, Gross       57,500   57,500     57,500        
Debt Instrument, Face Amount       57,500   57,500     57,500     $ 57,500  
The 2026 Notes Underwriter Option [Member]                          
Debt Instrument, Face Amount                       $ 7,500  
Debt Instrument, Convertible, Conversion Price (in dollars per share)                       $ 25  
The 2027 Notes [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                     6.25%    
Long-Term Debt, Gross       57,500   57,500     57,500        
Debt Instrument, Face Amount       $ 57,500   $ 57,500     $ 57,500   $ 50,000    
The 2027 Notes Underwriter Option [Member]                          
Debt Instrument, Face Amount                     $ 7,500    
Debt Instrument, Convertible, Conversion Price (in dollars per share)                     $ 25    
Minimum [Member]                          
Asset Coverage to Borrowings, Ratio, Percent           150.00%              
Minimum [Member] | Key Facility [Member] | Prime Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate       4.25%                  
Minimum [Member] | NYL Facility [Member] | USD Mid-market Swap Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate     3.55%                    
Maximum [Member] | NYL Facility [Member] | USD Mid-market Swap Rate [Member]                          
Debt Instrument, Basis Spread on Variable Rate     5.15%