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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
June 30, 2020
 
December 31, 2019
Raw materials
$
10,558,000

 
$
13,041,000

Work in process
1,623,000

 
1,818,000

Finished goods
4,044,000

 
6,823,000

 
$
16,225,000

 
$
21,682,000