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Fair Value (Tables)
6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Financial Assets and Liabilities Measured at Fair Value
(in thousands) Level 1   Level 2   Level 3 Total  
Assets        
  Short-term investments $8,714  $      -      $         -    $8,714 
  Marketable equity securities $1,196  $      -      -    $1,196 

  

(in thousands) Level 1 Level 2 Level 3 Total
Assets        
  Short-term investments $10,223  $   -    $  -    $10,223 
  Marketable equity securities $  1,585  $   -    $  -    $  1,585