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Note 7 - Intangible Assets
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
7
.
INTANGIBLE ASSETS
:
 
Intangible assets, included in Other assets on the Consolidated Balance Sheets, consist of the following (in thousands):
 
   
Gross Carrying
    
Accumulated
    
Intangible
  
   
Amount
    
Amortization
    
Assets, Net
  
As of December 31, 2018
  
 
 
 
  
 
 
 
  
 
 
 
Customer relationships
   $
1,378
     $
(689
 )   $
689
  
Trade names and trademarks
    
1,132
      
(377
 )    
755
  
Backlog
(1)
    
200
      
(91
 )    
109
  
Total
   $
2,710
     $
(1,157
 )   $
1,553
  
                         
As of December 31, 2017
  
 
 
 
  
 
 
 
  
 
 
 
Customer relationships
   $
1,378
     $
(551
 )   $
827
  
Patents
    
1,162
      
(929
 )    
233
  
Trade names and trademarks
    
1,132
      
(302
 )    
830
  
Other
(2)
    
176
      
(163
 )    
13
  
Total
   $
3,848
     $
(1,945
 )   $
1,903
  
 
(
1
) Backlog, included in the
July 2018
acquisition of Ameron, has a weighted-average amortization period of
eleven
 months.
(
2
) Other intangibles consist of favorable lease contracts and non-compete agreements.
 
The estimated amortization expense for each of the next
five
years and thereafter is as follows (in thousands):
 
Year ending December 31,
  
 
 
 
2019
   $
322
  
2020
    
213
  
2021
    
213
  
2022
    
213
  
2023
    
213
  
Thereafter
    
379
  
    $
1,553