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Inventory (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
March 31, 2020
 
December 31, 2019
Raw materials
$
13,328,000

 
$
13,041,000

Work in process
1,684,000

 
1,818,000

Finished goods
4,620,000

 
6,823,000

 
$
19,632,000

 
$
21,682,000