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Inventory (Notes)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
Inventories consisted of the following:

 
March 31, 2019
 
December 31, 2018
Raw materials
$
16,646,000

 
$
17,278,000

Work in process
1,993,000

 
2,034,000

Finished goods
7,476,000

 
6,453,000

 
$
26,115,000

 
$
25,765,000



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