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Note 13 - Financial Highlights (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Investment Company, Financial Highlights [Table Text Block]
  

Year ended December 31,

  
  

2023

   

2022

   

2021

   

2020

   

2019

  
  

(In thousands, except share and per share data)

  

Per share data:

                         

Net asset value at beginning of period

 $11.47   $11.56   $11.02   $11.83   $11.64  

Net investment income

  1.98    1.46    1.41    1.18    1.52  

Realized loss

  (0.97)   (0.38)   (0.18)   (0.84)   (0.31) 

Unrealized (depreciation) appreciation on investments

  (1.57)   (0.22)   0.16    0.02    0.24  

Net (decrease) increase in net assets resulting from operations

  (0.56)   0.86    1.39    0.36    1.45  

Distributions declared (1)

  (1.37)   (1.28)   (1.25)   (1.25)   (1.20) 

From net investment income

  (1.37)   (1.28)   (1.25)   (1.25)   (1.20) 

From net realized gain on investments

                    

Return of capital

                    

Other (2)

  0.17    0.33    0.40    0.08    (0.06) 

Net asset value at end of period

 $9.71   $11.47   $11.56   $11.02   $11.83  

Per share market value, beginning of period

 $11.60   $15.92   $13.24   $12.93   $11.25  

Per share market value, end of period

 $13.17   $11.60    15.92    13.24    12.93  

Total return based on a market value (3)

  25.3

%

   (19.3

)%

   29.7

%

   12.1

%

   25.6

%

 

Shares outstanding at end of period

  33,367,389    27,753,373    21,217,460    19,286,356    15,563,290  

Ratios to average net assets:

                         

Expenses without incentive value (4)

  14.1

%

   11.5

%

   10.5

%

   10.0

%

   10.8

%

 

Incentive fees (4)

  0.9

%

   2.6

%

   3.1

%

   2.6

%

   3.2

%

 

Net expenses (4)

  15.0

%

   14.1

%

   13.6

%

   12.6

%

   14.0

%

 

Net investment income with incentive fees (4)

  18.2

%

   12.1

%

   12.2

%

   10.4

%

   12.8

%

 

Ratios, without waivers, to average net assets:

                         

Expenses without incentive value (4)

  14.1%   11.5%   10.5%   10.0%   10.8% 

Incentive fees (4)

  0.9%   2.6%   3.1%   2.6%   4.4% 

Net expenses (4)

  15.0%   14.1%   13.6%   12.6%   15.2% 

Net investment income with incentive fees (4)

  18.2%   12.1%   12.2%   10.4%   11.6% 

Net assets at the end of the period

 $323,981   $318,448   $245,335   $212,597   $184,055  

Average net asset value

 $336,915   $299,182   $231,215   $199,302   $160,008  

Average debt per share

 $13.93   $13.70   $11.27   $9.97   $10.05  

Portfolio turnover ratio

  17.2

%

(5)

  14.6

%

(5)

  45.4

%

(5)

  38.7

%

(5)

  82.0

%

(6)