XML 37 R43.htm IDEA: XBRL DOCUMENT v2.4.0.6
Property, plant and equipment (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Property, plant and equipment [Abstract]          
Lease expiration year     Dec. 31, 2031    
Property, plant and equipment pledged for short-term bank loans $ 9,640,129   $ 9,640,129   $ 10,646,244
Depreciation and amortization $ 2,171,851 $ 1,122,519 $ 6,222,600 $ 3,311,618