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Note 12 - Other Income (Expense), Net (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
  

Three Months Ended March 31,

 
  

2021

  

2020

 

Interest income

 $2,282  $2,374 

Amortization of premium on available-for-sale securities

  (813)  (494)

Gain (loss) on deferred compensation plan investments

  1,177   (3,750)

Foreign currency exchange gain

  15   3 

Other

  (74)  153 

Total

 $2,587  $(1,714)