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Note 10 - Other Income, Net (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Interest income

 $11,637  $9,327  $7,305 

Amortization of premium on available-for-sale securities

  (4,674)  (2,979)  (729)

Gain on deferred compensation plan investments

  4,563   4,592   3,806 

Foreign currency exchange loss

  (727)  (1,364)  (310)

Other

  (997)  884   486 

Total

 $9,802  $10,460  $10,558