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Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
September 30, 2019
 
December 31, 2018
Raw materials
$
15,431,000

 
$
17,278,000

Work in process
1,740,000

 
2,034,000

Finished goods
6,242,000

 
6,453,000

 
$
23,413,000

 
$
25,765,000