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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consisted of the following (in thousands):
 
 
December 31,
 
 
2019
 
2018
Machinery, equipment and vehicles
 
$
17,170

 
$
18,121

Furniture and fixtures
 
3,530

 
3,779

Leasehold improvements
 
2,725

 
2,369

Buildings
 
321

 
311

 
 
23,746

 
24,580

Accumulated depreciation and amortization
 
(17,943
)
 
(18,721
)
 
 
$
5,803

 
$
5,859