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Note 5 - Investments (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Condensed Cash Flow Statement [Table Text Block]
  

March 31,
2023

  

March 31,
2022

 

Interest earned:

        

Short term investments and cash and cash equivalents

 $224  $31 

Net investment income

 $224  $31