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Concentration of Risk and Geographic Segment Data (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2012
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Jun. 25, 2011
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Jun. 30, 2012
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Jun. 25, 2011
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Dec. 31, 2011
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| Concentration Risk (Textual) [Abstract] | |||||
| Number of customers bearing more than 10% of net sales | 0 | 1 | 0 | 1 | |
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Concentration of Risk, Customer One [Member]
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| Concentration Risk (Textual) [Abstract] | |||||
| Percentage of net sales | 16.00% | 13.00% | 15.00% | 13.00% | |
| Accounts receivable | $ 1,647,000 | $ 1,647,000 | $ 1,641,000 | ||
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Concentration of Risk, Customer Two [Member]
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| Concentration Risk (Textual) [Abstract] | |||||
| Percentage of net sales | 9.00% | 8.00% | 11.00% | 10.00% | |
| Accounts receivable | $ 370,000 | $ 370,000 | $ 2,252,000 | ||
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Geographic Concentration Risk, Outside North America [Member]
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| Concentration Risk (Textual) [Abstract] | |||||
| Percentage of net sales | 32.00% | 34.00% | 32.00% | 32.00% | |
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Maximum [Member] | Concentration of Risk, Other Customer [Member]
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| Concentration Risk (Textual) [Abstract] | |||||
| Percentage of net sales | 10.00% | 10.00% | |||
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Maximum [Member] | Geographic Concentration Risk, United States [Member]
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| Concentration Risk (Textual) [Abstract] | |||||
| Percentage of net sales | 10.00% | 10.00% | |||