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Note 2 - Revenue From Contracts With Customers (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31,
 
   
2020
   
2019
 
Over time
   
58
%    
75
%
Point-in-time
   
42
%    
25
%
Total
   
100
%    
100
%