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Concentrations (Details Textuals)	3 Months Ended		6 Months Ended
Concentrations (Details Textuals)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Concentrations
Sales to five largest customers of net sales	23.00%	29.00%	38.00%	25.00%
Concentration of customers	no single customer represented over 10% of total sales	Sales to one customer accounted for 10% of total sales

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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