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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]
Leasehold improvements
 
Shorter of estimated useful life or remaining lease term
Buildings and improvements (in years)
 
20
-
40
Machinery & Equipment
(in years)
 
7
-
15
Furniture, fixtures, computers & software
(in years)
 
3
-
7
Schedule of Goodwill [Table Text Block]
 
 
Goodwill
 
 
 
 
 
December 31, 2017
 
$
7,322
 
 
Acquired in Dielectrics business combination (See Note 22)
 
 
44,516
 
 
December 31, 2018
 
$
51,838
 
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Years Ended December 31,
    2018   2017   2016
Share-based compensation expense   $
1,212
     $
1,068
     $
1,056
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Expected volatility
 
 
27.7
%
 
 
27.4%
-
29.1%
 
 
 
29.7
%
Expected dividends
 
 
None
 
 
 
 
None
 
 
 
 
None
 
Risk-free interest rate
 
 
2.7
%
 
 
1.56%
-
1.84%
 
 
 
0.9
%
Exercise price
 
$
31.20
 
 
 
$27.05
–
$28.70
 
 
$
22.02
 
Expected term (in years)
 
 
6.0
 
 
 
2.7
to
5.8
 
 
 
5.0
 
Weighted-average grant-date fair value
 
$
10.15
 
 
 
5.59
-
$8.51
 
 
$
6.11