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Note 14 - Commitments
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Commitments and Contingencies Disclosure [Text Block]
 
Note
1
4
– Commitments
 
The Company leases property from
third
parties. The Company leases
three
of its U.S. facilities with terms expiring at various times from
2019
to
2022.
The Company also leases office space in the United Kingdom, France, Germany, Sweden and Italy with terms expiring at various times from
2019
to
2025.
The Company leases an office and manufacturing space in Japan, and the initial term expires in
April 2023.
The Company also leases manufacturing space in Germany with terms expiring at various times from
2019
to
2028.
 
Future minimum commitments under non-cancelable leases at
December 
31,
2018,
are as follows:
 
         
   
Operating
Leases
  
(in thousands)
        
Years Ending December 31,
  
 
 
 
2019
   $
3,411
  
2020
    
2,612
  
2021
    
2,266
  
2022
    
2,211
  
2023
    
975
  
After 2023
    
2,142
  
Total future minimum lease payments
   $
13,617
  
         
 
Rental expense was approximately
$4.2
million,
$3.0
million and
$3.6
million for the years ended
December 
31,
2018,
2017
and
2016,
respectively.