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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 26 Months Ended
Jun. 02, 2023
Mar. 14, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Apr. 28, 2022
Aug. 02, 2021
Investments, Nonaccrual, Interest Income     $ 0 $ 0 $ 0 $ 0        
Interest Income, Operating, Paid in Kind     $ 1,000 $ 0 $ 2,154 $ 0        
Investment, Nonaccrual, Income Not Received in Cash, Percent     3.10% 6.80% 4.70% 8.00%        
Debt Issuance Costs, Net     $ 6,900   $ 6,900   $ 6,900 $ 7,100    
Accumulated Amortization, Debt Issuance Costs     5,800   5,800   $ 5,800 4,800    
Amortization of Debt Issuance Costs     $ 500 $ 400 $ 950 $ 705        
Federal Excise Tax, Percent     4.00%   4.00%   4.00%      
Investment Income, Operating, Tax Expense (Benefit)     $ 179 $ 106 $ 363 206        
Open Tax Year         2019 2020 2021          
Proceeds from Issuance of Common Stock         $ 51,175 $ 48,529        
Stock Repurchase Program, Remaining Authorized Repurchase Amount                 $ 5,000  
Stock Repurchased During Period, Shares (in shares)     0 0 0 0 167,465      
Stock Repurchased During Period, Per Share (in dollars per share)             $ 11.22      
Stock Repurchased During Period, Value             $ 1,900      
The 2021 Equity Distribution Agreement [Member]                    
Equity Sales Agreement, Maximum Value                   $ 100,000
Stock Issued During Period, Shares, New Issues (in shares)     448,175 868,230 1,054,023 1,118,401        
Proceeds from Issuance of Common Stock     $ 5,100 $ 10,300 $ 12,300 $ 14,200        
Payments of Stock Issuance Costs     100 $ 200 300 $ 200        
Equity Sales Agreement, Remaining Amount Available for Issuance     18,900   18,900   18,900      
Public Offering [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 3,250,000 2,500,000                
Proceeds from Issuance of Common Stock $ 38,900 $ 34,300                
Shares Issued, Price Per Share (in dollars per share) $ 12.50 $ 14.35                
Two Investments [Member]                    
Investments, Cost, Nonaccrual Status     25,600   25,600   25,600      
Investments, Fair Value, Nonaccrual Status     $ 15,300   $ 15,300   $ 15,300      
Three Investments [Member]                    
Investments, Cost, Nonaccrual Status               20,900    
Investments, Fair Value, Nonaccrual Status               $ 8,300