Inventories by Major Categories (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Schedule of Inventory [Line Items]
Raw materials	$ 10,082,532	$ 9,371,850
Work in progress	710,548	556,816
Inventories	17,764,641	15,502,246
Copper and CCA wire
Schedule of Inventory [Line Items]
Other inventory	2,392,242	2,925,769
Copper rod and anode
Schedule of Inventory [Line Items]
Other inventory	$ 4,579,319	$ 2,647,811

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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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- Definition

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.

+ References

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- Definition

Gross amount of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

+ References

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Gross amount of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

+ References

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