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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Available-for-sale Securities [Table Text Block]
   

June 30, 2021

  

December 31, 2020

 
 

Fair Value Level1

 

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

  

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

 

Money market funds

Level 1

 $42,735  $  $42,735  $21,042  $  $21,042 

Time deposits

Level 2

           5,458      5,458 

Government and municipal debt securities

Level 2

  22,993   (2)  22,991   30,280   (5)  30,275 

Corporate debt securities

Level 2

  809      809   11,621   (6)  11,615 

Total investments

 $66,537  $(2) $66,535  $68,401  $(11) $68,390