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Note 12 - Other Income, Net (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Interest income

 $2,311  $1,850  $7,073  $5,207 

Amortization of premium on available-for-sale securities

  (863)  (168)  (1,984)  (384)

Gain on deferred compensation plan investments

  1,598   74   1,420   2,630 

Foreign currency exchange gain (loss)

  (759)  175   (889)  47 

Other

  207   326   360   327 

Total

 $2,494  $2,257  $5,980  $7,827