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Note 2 - Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
Net sales of:                        
Products   $
193,016
     $
183,186
     $
146,275
  
Tooling and Machinery    
2,730
      
4,302
      
1,181
  
Engineering services    
2,635
      
2,967
      
387
  
Total net sales   $
198,381
     $
190,455
     $
147,843
  
Contract with Customer, Asset and Liability [Table Text Block]
    Contract Liabilities
    Years Ended
    December 31,
    2019   2018
Deferred revenue - beginning of period   $
2,507
     $
871
  
Acquired in Dielectrics business combination    
-
      
2,175
  
Increases due to consideration received from customers    
3,216
      
4,188
  
Revenue recognized    
(3,149
 )    
(4,727
 )
Deferred revenue - end of period   $
2,574
     $
2,507
  
    Contract Assets
    Years Ended
    December 31,
    2019   2018
         
Unbilled Receivables - beginning of period   $
65
     $
-
  
Increases due to revenue recognized - not invoiced to customers    
831
      
301
  
Decreases due to customer invoicing    
(824
 )    
(236
 )
Unbilled Receivables - end of period   $
72
     $
65