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Note 1 - Organization and Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
   
Three Months Ended March 31,
 
Revenue by customers’ geographic locations
 
2020
   
2019
 
United States
   
74
%
   
60
%
Canada
   
11
%
   
23
%
Europe, Middle East, Africa (EMEA)
   
12
%
   
13
%
Other
   
3
%
   
4
%
Total revenue
   
100
%
   
100
%