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Information Concerning Industry Segments And Major Customers (Narrative) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Segment Reporting Information [Line Items] | |||
| Number of segments | 3 | ||
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Sales [Member] | Suttle [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 16.60% | ||
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Sales [Member] | Transition Networks [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 10.60% | 22.80% | |
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Sales [Member] | JDL Technologies [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 10.30% | ||
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Foreign [Member] | Suttle [Member]
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| Segment Reporting Information [Line Items] | |||
| Long-lived assets | 1,067,000 | 831,000 | |
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United States [Member] | Sales [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 83.00% | 85.00% | 81.00% |
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Customer 1 [Member] | Sales [Member] | Transition Networks [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 15.10% | ||
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Customer 2 [Member] | Sales [Member] | Transition Networks [Member]
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| Segment Reporting Information [Line Items] | |||
| Concentration risk percentage | 12.00% | ||