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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended 44 Months Ended
Jun. 02, 2023
Mar. 14, 2022
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Apr. 26, 2024
Sep. 22, 2023
Aug. 02, 2021
Investments, Nonaccrual, Interest Income     $ 200   $ 0 $ 0        
Investment, Income Attributable to Non-cash Paid-in-Kind Interest, Percent       3.30% 7.40%          
Interest Income, Operating, Paid in Kind       $ 3,261 $ 8,433 $ (0)        
Investment, Nonaccrual, Income Not Received in Cash, Percent       5.60% 4.20% 7.40%        
Debt Issuance Costs, Net     8,900 $ 8,900 $ 5,800   $ 8,900      
Accumulated Amortization, Debt Issuance Costs     $ 7,200 7,200 6,900   $ 7,200      
Amortization of Debt Issuance Costs       1,783 1,852 $ 1,604        
Adjustments to Additional Paid in Capital, Non-deductible Excise Taxes Paid       $ 1,500 1,500 700        
Federal Excise Tax, Percent     4.00% 4.00%     4.00%      
Excise and Sales Taxes       $ 1,500 1,500 700        
Unrecognized Tax Benefits, Ending Balance     $ 0 $ 0 0   $ 0      
Open Tax Year       2024 2023 2022 2021            
Proceeds from Issuance of Common Stock       $ 66,353 $ 65,093 $ 84,603        
Share Repurchase Program, Remaining Authorized, Amount               $ 5,000    
Stock Repurchased During Period, Shares (in shares)       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
Equity Sales Agreement, Remaining Amount Available for Issuance                 $ 0  
Stock Issued During Period, Shares, New Issues (in shares)           3,982,684        
Proceeds from Issuance of Common Stock           $ 50,300        
Payments of Stock Issuance Costs           $ 1,000        
The 2023 Equity Distribution Agreement [Member]                    
Equity Sales Agreement, Maximum Value                 $ 150,000  
Equity Sales Agreement, Remaining Amount Available for Issuance     79,000 $ 79,000     79,000      
Stock Issued During Period, Shares, New Issues (in shares)       6,300,095            
Proceeds from Issuance of Common Stock       $ 66,400            
Payments of Stock Issuance Costs       1,400            
The 2023 and 2021 Equity Distribution Agreements [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)         2,248,830          
Proceeds from Issuance of Common Stock         $ 26,200          
Payments of Stock Issuance Costs         700          
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) $ 12.5 $ 14.35                
Four Investments [Member]                    
Investments, Cost, Nonaccrual Status     44,800 44,800 72,500   44,800      
Investments, Fair Value, Nonaccrual Status     $ 10,500 10,500 27,600   $ 10,500      
Two Investments [Member]                    
Interest Income, Operating, Paid in Kind       $ 1,800 $ 3,900