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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
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
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
Share-based compensation expense   $
1,591
     $
1,212
     $
1,068
  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
Expected volatility    
28.9
 %    
27.7
 %  
27.4%
-
29.1%
Expected dividends    
None
      
None
    
 
None
 
Risk-free interest rate    
2.3
 %    
2.7
 %  
1.56%
-
1.84%
Exercise price   $
38.61
     $
31.20
    
$27.05
-
$28.70
Expected term (in years)    
6.0
      
6.0
    
2.7
to
5.8
Weighted-average grant date fair value   $
12.70
     $
10.15
    
$5.59
-
$8.51