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Note 11 - Revenue (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31,
 
   
2020
   
2019
 
                 
Over time
  $
60,878
    $
62,643
 
Point in time
   
8,045
     
-
 
Net sales
  $
68,923
    $
62,643