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Note 5 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Available-for-sale Securities [Table Text Block]
    

December 31, 2020

  

December 31, 2019

 
  

Fair Value Level1

 

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

  

Adjusted Cost

  

Gross Unrealized Losses

  

Fair Value

 

Money market funds

 

Level 1

 $21,042  $  $21,042  $11,659  $  $11,659 

Time deposits

 

Level 2

  5,458      5,458   13,544      13,544 

Municipal debt securities

 

Level 2

  30,280   (5)  30,275   347      347 

Corporate debt securities

 

Level 2

  11,621   (6)  11,615   56,784   (19)  56,765 

Total investments

   $68,401  $(11) $68,390  $82,334  $(19) $82,315