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Note 4 - Revenue Disaggregation (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31, 2020
  
   
Over time
    
Point in time
    
Total
  
Aerospace
   $
1,187
     $
2,296
     $
3,483
  
Industrial
   $
520
     $
262
     $
782
  
Research
   $
1,687
     $
84
     $
1,771
  
Total
   $
3,394
     $
2,642
     $
6,036
  
   
Three Months Ended March 31, 2019
  
   
Over time
    
Point in time
    
Total
  
Aerospace
   $
247
     $
745
     $
992
  
Industrial
   $
1,365
     $
68
     $
1,433
  
Research
   $
1,017
     $
27
     $
1,044
  
Total
   $
2,629
     $
840
     $
3,469