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Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2018
Property and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and equipment, net, as of March 31, 2018 and December 31, 2017 consist of the following:

 
March 31,
2018
 
December 31,
2017
Land
$
3,828

 
$
3,828

Building and improvements
24,042

 
24,038

Leasehold improvements
475

 
429

Machinery and equipment
24,465

 
24,764

Revenue-generating assets
34,880

 
28,453

Office and computer equipment
13,171

 
13,057

Motor vehicles
51

 
51

 
100,912

 
94,620

Less accumulated depreciation
(52,767
)
 
(51,099
)
 
$
48,145

 
$
43,521