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Inventories (Details) (USD $)	Sep. 29, 2012	Dec. 31, 2011
Components of inventories [Abstract]
Raw material and component parts	$ 11,532,392	$ 11,863,199
Work in process	6,258,785	6,425,914
Finished goods	11,184,681	11,504,321
Inventories	$ 28,975,858	$ 29,793,434

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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