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Note 2 - Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
Net sales of:   2019   2018   2019   2018
Products   $
47,400
     $
46,423
     $
144,386
     $
135,670
  
Tooling and machinery    
952
      
537
      
1,920
      
2,135
  
Engineering services    
1,042
      
848
      
1,814
      
1,953
  
Total net sales   $
49,394
     $
47,808
     $
148,120
     $
139,758
  
Contract with Customer, Asset and Liability [Table Text Block]
    Contract Liabilities
    Nine Months Ended
September 30,
    2019   2018
Deferred revenue - beginning of period   $
2,507
     $
871
  
Acquired in Dielectrics business combination    
-
      
2,175
  
Increases due to consideration received from customers    
2,256
      
3,088
  
Revenue recognized    
(2,231
 )    
(2,216
 )
Deferred revenue - end of period   $
2,532
     $
3,918
  
    Contract Assets
    Nine Months Ended
September 30,
    2019   2018
Unbilled Receivables - beginning of period   $
65
     $
-
  
Increases due to revenue recognized - not invoiced to customers    
660
      
236
  
Decreases due to customer invoicing    
(712
 )    
(188
 )
Unbilled Receivables - end of period   $
13
     $
48