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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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 Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
    Years Ended December 31,
    2017   2016   2015
Share-based compensation expense   $
1,068
     $
1,056
     $
1,069
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Years Ended December 31,
    2017   2016   2015
Expected volatility  
27.4%
-
29.1%
    
29.7
 %  
31.5%
-
32.3%
Expected dividends  
 
None
 
    
None
    
 
None
 
Risk-free interest rate  
1.56%
-
1.84%
    
0.9
 %  
1.0%
-
1.2%
Exercise price  
$27.05
–
$28.70
   $
22.02
    
$19.97
-
$22.36
Expected term (in years)  
2.7
to
5.8
    
5.0
    
 
5.0
 
Weighted-average grant-date fair value  
$5.59
-
$8.51
   $
6.11
    
$6.04