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Inventories (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2014 Certain raw materials USD ($)	Dec. 31, 2014 Certain raw materials CNY	Dec. 31, 2013 Certain raw materials CNY
Inventories
Raw materials	$ 68,932,877us-gaap_InventoryRawMaterials	421,800,272us-gaap_InventoryRawMaterials	320,486,533us-gaap_InventoryRawMaterials
Work-in-process	523,311us-gaap_InventoryWorkInProcess	3,202,142us-gaap_InventoryWorkInProcess	3,574,268us-gaap_InventoryWorkInProcess
Finished goods	11,726,133us-gaap_InventoryFinishedGoods	71,752,211us-gaap_InventoryFinishedGoods	29,145,319us-gaap_InventoryFinishedGoods
Total inventories	81,182,321us-gaap_InventoryNet	496,754,625us-gaap_InventoryNet	353,206,120us-gaap_InventoryNet
Inventories
Amount pledged as collateral for borrowings from financial institutions				$ 30,031,961	183,765,570	0