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Note 7 - Borrowings - Senior Securities (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance outstanding [1] $ 439,323 $ 260,250 $ 187,625 $ 154,375 $ 127,875
Asset Coverage Per Unit (in dollars per share) [2] $ 1,725 $ 1,943 $ 2,133 $ 2,192 $ 2,050
Involuntary Liquidation Preference (in dollars per share) [3] $ 0 $ 0 $ 0 $ 0 $ 0
Credit Facilities [Member]          
Balance outstanding [1] $ 181,750 $ 132,250 $ 50,250 $ 17,000 $ 90,500
Asset Coverage Per Unit (in dollars per share) [2] $ 4,169 $ 3,823 $ 7,965 $ 19,908 $ 2,896
Involuntary Liquidation Preference (in dollars per share) [3] $ 0 $ 0 $ 0 $ 0 $ 0
The 2027 Notes [Member]          
Balance outstanding $ 57,500 [1] $ 0      
Asset Coverage Per Unit (in dollars per share) [2] $ 13,179        
Involuntary Liquidation Preference (in dollars per share) [3] 0        
Average market value per unit (in dollars per share) [4] $ 24.09        
The 2026 Notes [Member]          
Balance outstanding [1] $ 57,500 $ 57,500      
Asset Coverage Per Unit (in dollars per share) [2] $ 13,179 $ 8,793      
Involuntary Liquidation Preference (in dollars per share) [3] 0 0      
Average market value per unit (in dollars per share) [4] $ 24.45 $ 25.90      
The 2022 Notes [Member]          
Balance outstanding [1] $ 0 $ 0 $ 37,375 $ 37,375 $ 37,375
Asset Coverage Per Unit (in dollars per share) [2] $ 0 $ 0 $ 10,708 $ 9,055 $ 7,014
Involuntary Liquidation Preference (in dollars per share) [3] $ 0 $ 0 0 0  
Average market value per unit (in dollars per share) [4]     $ 24.60 $ 25.53 $ 25.52
The 2022-1 Securitization [Member]          
Balance outstanding [1] $ 100,000        
Asset Coverage Per Unit (in dollars per share) [2] $ 7,578        
Involuntary Liquidation Preference (in dollars per share) [3] $ 0        
The 2019-1 Securitization [Member]          
Balance outstanding [1] $ 42,573 $ 70,500 $ 100,000 $ 100,000  
Asset Coverage Per Unit (in dollars per share) [2] $ 17,799 $ 7,171 $ 4,002 $ 3,384  
Involuntary Liquidation Preference (in dollars per share) [3] $ 0 $ 0 $ 0 $ 0  
[1] Total amount of senior securities outstanding at the end of the period presented.
[2] Asset coverage per unit is the ratio of the original cost less accumulated depreciation, amortization or impairment of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness.
[3] The amount which the holder of such class of senior security would be entitled upon the voluntary liquidation of the applicable issuer in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of securities.
[4] Not applicable to the Company’s credit facilities, 2019-1 Securitization and 2022-1 Securitization because such securities are not registered for public trading.