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3. INVENTORIES (Details) - Inventory Detail (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Inventory Detail [Abstract]      
Raw materials $ 12,931,069us-gaap_InventoryRawMaterialsAndSupplies $ 11,702,762us-gaap_InventoryRawMaterialsAndSupplies $ 13,368,153us-gaap_InventoryRawMaterialsAndSupplies
Work-in-process 877,162us-gaap_InventoryWorkInProcess 577,127us-gaap_InventoryWorkInProcess 1,035,510us-gaap_InventoryWorkInProcess
Finished goods 69,317,040us-gaap_InventoryFinishedGoods 72,957,153us-gaap_InventoryFinishedGoods 63,904,996us-gaap_InventoryFinishedGoods
Total $ 83,125,271us-gaap_InventoryNet $ 85,237,042us-gaap_InventoryNet $ 78,308,659us-gaap_InventoryNet