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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

 

March 31

2018

 

December 31

2017

In thousands

 

Raw materials

$

1,004

 

$

1,204

Work-in-progress

 

652

   

704

Finished goods

 

218

 

 

256

Total Inventory

$

1,874

 

$

2,164