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Inventories (Details) (USD $)	Mar. 30, 2013	Dec. 29, 2012
Components of inventories [Abstract]
Raw material and component parts	$ 8,579,917	$ 8,473,007
Work in process	6,256,190	6,160,578
Finished goods	14,955,273	14,751,195
Inventories	$ 29,791,380	$ 29,384,780

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, 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.

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