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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 4 Months Ended 12 Months Ended 20 Months Ended
Mar. 14, 2022
Mar. 03, 2022
Apr. 21, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Apr. 23, 2022
Aug. 02, 2021
Jul. 30, 2020
Aug. 02, 2019
Investments, Nonaccrual, Interest Income       $ 0 $ 1,300 $ 30          
Investment, Nonaccrual, Income Not Received in Cash, Percent       7.40% 5.90% 5.80%          
Debt Issuance Costs, Net, Total   $ 7,100     $ 4,300            
Deferred Finance Costs, Accumulated Amortization   4,800     3,200            
Amortization of Debt Issuance Costs   1,600   $ 1,604 1,091 $ 1,018          
Adjustments to Additional Paid in Capital, Non-deductible Excise Taxes Paid   $ 700     400 200          
Federal Excise Tax, Percent   4.00%   4.00%     4.00%        
Excise and Sales Taxes   $ 700   $ 715 401 222          
Unrecognized Tax Benefits, Ending Balance       $ 0 0   $ 0        
Open Tax Year       2019 2020 2021              
Proceeds from Issuance of Common Stock       $ 84,603 $ 30,086 $ 44,611          
Stock Repurchase Program, Remaining Authorized Repurchase 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 2019 Equity Distribution Agreement [Member]                      
Equity Sales Agreement, Maximum Value                     $ 50,000
The 2020 Equity Distribution Agreement [Member]                      
Equity Sales Agreement, Maximum Value                   $ 100,000  
The 2021 Equity Distribution Agreement [Member]                      
Equity Sales Agreement, Maximum Value                 $ 100,000    
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              
Equity Sales Agreement, Remaining Amount Available for Issuance       $ 31,500     $ 31,500        
Public Offering [Member]                      
Stock Issued During Period, Shares, New Issues (in shares) 2,500,000                    
Shares Issued, Price Per Share (in dollars per share) $ 14.35                    
Proceeds from Issuance of Common Stock $ 34,300                    
The 2020 Equity Distribution Agreement and the 2021 Equity Distribution Agreement [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)         1,907,234            
Proceeds from Issuance of Common Stock         $ 30,100            
Payments of Stock Issuance Costs         800            
The 2019 Equity Distribution Agreement and the 2020 Equity Distribution Agreement [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)           3,702,500          
Proceeds from Issuance of Common Stock           $ 44,600          
Payments of Stock Issuance Costs           $ 1,000          
HSLFI [Member]                      
Dividend Income, Operating, Total     $ 0                
Three Investments [Member]                      
Investments, Cost, Nonaccrual Status   20,900                  
Investments, Fair Value, Nonaccrual Status   $ 8,300                  
One Investment [Member]                      
Investments, Cost, Nonaccrual Status         11,500            
Investments, Fair Value, Nonaccrual Status         $ 6,900