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Inventories (Details) (USD $)	Mar. 29, 2014	Dec. 28, 2013
Components of inventories [Abstract]
Raw material and component parts	$ 8,141,568	$ 8,256,977
Work in process	4,872,835	4,925,001
Finished goods	17,251,650	17,475,634
Inventories	$ 30,266,053	$ 30,657,612

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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