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Inventories (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Inventories    
Raw materials $ 2,133,757 $ 1,952,398
Work-in-progress 362,568 389,501
Finished goods 1,658,622 1,461,264
Reduction to LIFO cost (1,266,350) (1,248,221)
Total Inventory $ 2,888,597 $ 2,554,942