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Inventories
6 Months Ended
Jun. 30, 2013
Inventory, Net [Abstract]  
Inventory Disclosure [Text Block]
5. Inventories, net
 
June 30, 2013
 
December 31, 2012
Raw materials
$
403,374

 
$
386,119

Work in progress
182,944

 
182,060

Finished goods
384,913

 
360,168

Subtotal
971,231

 
928,347

Less LIFO reserve
(54,014
)
 
(55,506
)
Total
$
917,217

 
$
872,841