Inventories (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Components of inventory
Raw materials	$ 7,974,309	$ 5,606,073
Work-in-progress	8,996,610	7,919,403
Finished goods	22,930,130	23,916,206
Inventory gross	39,901,049	37,441,682
Less: allowance for obsolete inventories	(1,030,351)	(566,878)
Total inventories	$ 38,870,698	$ 36,874,804

Certain changes made in the current period to the value and amount of inventory reported.

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Amount before last-in first-out (LIFO) and valuation reserves of merchandise or goods held by the entity that are readily available for sale.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Gross amount of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

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