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Note 2 - Revenue From Contracts With Customers (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Over time

  64%  58%  61%  66%

Point-in-time

  36%  42%  39%  34%

Total

  100%  100%  100%  100%