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Note 4 - Investments (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Investment Holdings, Schedule of Investments [Table Text Block]
  

December 31, 2022

  

December 31, 2021

 
  

Cost

  

Fair Value

  

Cost

  

Fair Value

 
  

(In thousands)

 

Investments

                

Debt

 $701,074  $686,458  $441,885  $437,317 

Warrants

  14,790   29,712   10,023   20,200 

Other

  1,200   1,300   1,450   200 

Equity

  4,184   2,556   479   358 

Total investments

 $721,248  $720,026  $453,837  $458,075 
  

December 31, 2022

  

December 31, 2021

 
  

Cost

  

Fair Value

  

Cost

  

Fair Value

 
  

(In thousands)

 

Life Science

                

Biotechnology

 $193,372  $195,006  $109,899  $107,902 

Medical Device

  132,803   135,960   88,681   84,567 

Technology

                

Communications

  22,892   26,176   22,853   25,920 

Consumer-Related

  121,961   114,050   92,158   93,194 

Data Storage

  476   1,316   476   1,047 

Internet and Media

  329   1,159   569   3,305 

Networking

  11,831   11,710   17,390   17,964 

Power Management

  1,585   2,610   1,585   2,609 

Semiconductors

  56      101    

Software

  120,157   118,716   60,902   60,807 

Sustainability

                

Energy Efficiency

  8   27       

Other Sustainability

  84,633   85,524   46,595   47,011 

Healthcare Information and Services

                

Diagnostics

  9,851   9,858   12,393   12,377 

Other

  7,559   3,870   175   1,177 

Software

  13,735   14,044   60   195 

Total investments

 $721,248  $720,026  $453,837  $458,075 
Selected Statement of Operations for Nonconsolidated Investment [Table Text Block]
  

For the period

 
  

January 1, 2020

 
  

through

 
  

April 21, 2020

 
  

(In thousands)

 

Selected Statements of Operations Information

    

Interest income on investments

 $1,353 

Total investment income

 $1,465 

Total expenses

 $1,229 

Net investment income

 $236 

Net realized gain on investments

 $120 

Net unrealized depreciation on investments

 $(392)

Net decrease in net assets resulting from operations

 $(36)