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INVENTORIES
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
 
Inventories are stated at the lower of cost (first-in, first-out) or net realizable value. Significant cost elements included in inventory are material, labor, freight, subcontract costs, and manufacturing overhead. As necessary, we adjust inventory to its net realizable value by recording provisions for excess, slow moving and obsolete inventory. We regularly review inventory quantities on hand and values, and compare them to estimates of future product demand, market conditions, production requirements and technological developments.

Inventories consisted of the following:
 
March 31,
2019
 
December 31,
2018
Raw materials
$
26,669

 
$
26,544

Work-in-process
6,934

 
7,157

Finished goods
16,888

 
16,904

Supplies
360

 
469

 
$
50,851

 
$
51,074