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Inventory (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Inventory.    
Raw materials and supplies $ 22,654,432us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 18,501,386us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work-in-process 2,092,409us-gaap_InventoryWorkInProcessNetOfReserves 237,268us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 7,346,074us-gaap_InventoryFinishedGoodsNetOfReserves 5,996,947us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventory $ 32,092,915us-gaap_InventoryNet $ 24,735,601us-gaap_InventoryNet