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Note 1 - Organization and Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
  Three Months Ended  Nine Months Ended 
  September 30,  September 30, 

Revenue by customers geographic locations

 

2021

  

2020

  

2021

  

2020

 

North America

  88

%

  84

%

  87

%

  86

%

Europe, Middle East, Africa (EMEA)

  9

%

  13

%

  10

%

  12

%

Other

  3

%

  3

%

  3

%

  2

%

Total revenue

  100

%

  100

%

  100

%

  100

%