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Note 7 - Borrowings - Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 04, 2025
Dec. 31, 2024
Oct. 17, 2024
Nov. 09, 2022
Jun. 15, 2022
Mar. 30, 2021
Total commitment $ 757,750   $ 716,078        
Balance outstanding 428,750   472,078        
Unused commitment 329,000   244,000        
Unamortized debt issuance costs attributable to term borrowings (4,719)   (4,174)        
Total borrowings outstanding, net 424,031   467,904        
Key Facility [Member]              
Total commitment 150,000   150,000        
Balance outstanding 0   0        
Unused commitment 150,000   150,000        
NYL Facility [Member]              
Total commitment 250,000   250,000        
Balance outstanding 181,000   181,000        
Unused commitment 69,000   69,000        
Nuveen Facility [Member]              
Total commitment 200,000   100,000        
Balance outstanding 90,000   75,000        
Unused commitment 110,000   25,000        
Asset-backed Notes 2022 [Member]              
Total commitment 0   81,078   $ 157,800    
Balance outstanding 0   81,078        
Unused commitment 0   0        
Unamortized debt issuance costs attributable to term borrowings (900)            
The 2027 Notes [Member]              
Total commitment 57,500   57,500     $ 50,000  
Balance outstanding 57,500   57,500        
Unused commitment 0   0        
The 2026 Notes [Member]              
Total commitment 57,500   57,500       $ 57,500
Balance outstanding 57,500   57,500        
Unused commitment 0   0        
The 2030 Convertible Notes [Member]              
Total commitment 40,000 $ 40,000 0        
Balance outstanding 40,000   0        
Unused commitment 0   0        
The 2031 Convertible Notes [Member]              
Total commitment 2,750   20,000 $ 20,000      
Balance outstanding 2,750   20,000        
Unused commitment $ 0   $ 0