XML 25 R14.htm IDEA: XBRL DOCUMENT v3.10.0.1
Inventory (Notes)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
Inventories, which include material, labor and manufacturing overhead, are valued at the lower of cost or market. The inventories are accounted for using the first-in, first-out (FIFO) method of determining inventory costs. Inventories consisted of the following:

 
June 30, 2018
 
December 31, 2017
Raw materials
$
13,984,000

 
$
8,450,000

Work in process
1,235,000

 
2,061,000

Finished goods
4,464,000

 
2,948,000

 
$
19,683,000

 
$
13,459,000



Inventory quantities on-hand are regularly reviewed, and where necessary, provisions for excess and obsolete inventory are recorded based on historical and anticipated usage.