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Inventories
3 Months Ended
Mar. 31, 2013
Inventory, Net [Abstract]  
Inventory Disclosure [Text Block]
4. Inventories, net
 
March 31, 2013
 
December 31, 2012
Raw materials
$
392,199

 
$
386,119

Work in progress
184,510

 
182,060

Finished goods
382,153

 
360,168

Subtotal
958,862

 
928,347

Less LIFO reserve
(52,910
)
 
(55,506
)
Total
$
905,952

 
$
872,841