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Note 2 - Revenue Recognition (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
    As Reported       As Adjusted
    December 31,
2017
  Cumulative
Adjustments
  January 1,
2018
Assets:                        
Property, plant and equipment   $
106,716
    $
1,027
    $
107,743
 
Accumulated depreciation and amortization    
(53,064
)    
(548
)    
(53,612
)
Net property, plant and equipment    
53,652
     
479
     
54,131
 
Liabilities:                        
Deferred revenue    
297
     
574
     
871
 
Deferred income taxes    
2,440
     
(25
)    
2,415
 
Stockholders' equity:                        
Retained earnings    
97,562
     
(70
)    
97,492
 
    September 30, 2018
    As Reported   Balances
without
adoption of
ASC 606
  Difference
Assets:            
Property, plant and equipment   $
112,503
    $
111,230
    $
1,273
 
Accumulated depreciation and amortization    
(54,044
)    
(53,145
)    
(899
)
Net property, plant and equipment    
58,459
     
58,085
     
374
 
Liabilities:                        
Deferred revenue    
3,918
     
3,502
     
416
 
Deferred income taxes    
3,256
     
3,281
     
(25
)
Stockholders' equity:                        
Retained earnings    
107,392
     
107,409
     
(17
)
    For the Nine Months Ended September 30, 2018
    As Reported   Balances
without
adoption of
ASC 606
  Difference
Net sales   $
139,758
    $
139,600
    $
158
 
Cost of sales    
104,156
     
104,051
     
105
 
Gross profit    
35,602
     
35,549
     
53
 
Disaggregation of Revenue [Table Text Block]
    Three Months Ended
September 30,
  Nine Months Ended
September 30,
    2018   2017   2018   2017
Net sales of:        
Products   $
46,423
    $
35,301
    $
135,670
    $
109,196
 
Tooling and Machinery    
537
     
277
     
2,135
     
1,150
 
Engineering services    
848
     
106
     
1,953
     
277
 
Total net sales   $
47,808
    $
35,684
    $
139,758
    $
110,623
 
Contract with Customer, Asset and Liability [Table Text Block]
    Contract
Liabilities
     
Deferred revenue - January 1, 2018   $
871
 
Acquired in Dielectrics business combination    
2,175
 
Increases due to consideration received from customers    
3,088
 
Revenue recognized    
(2,216
)
Deferred revenue - September 30, 2018   $
3,918