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Major customers (Details)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
|
|
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Purchases | Vendor concentration risk
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| Significant Customers | ||||
| Number of vendors | 1 | 1 | ||
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Purchases | Vendor concentration risk | One major vendor
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| Significant Customers | ||||
| Percentage of concentration risk | 14.50% | 13.90% | 14.60% | 11.90% |
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Net sales | Customer concentration risk
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| Significant Customers | ||||
| Number of customers | 3 | |||
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Net sales | Customer concentration risk | Customer one
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| Significant Customers | ||||
| Percentage of concentration risk | 13.70% | 14.60% | 13.40% | 14.50% |
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Net sales | Customer concentration risk | Customer two
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| Significant Customers | ||||
| Percentage of concentration risk | 15.90% | 11.40% | 13.30% | 11.00% |
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Net sales | Customer concentration risk | Customer three
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| Significant Customers | ||||
| Percentage of concentration risk | 13.00% | 11.00% | 12.30% | 10.70% |
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Net accounts receivable | Customer concentration risk | Customer one
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| Significant Customers | ||||
| Percentage of concentration risk | 12.00% | |||
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Net accounts receivable | Customer concentration risk | Customer two
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| Significant Customers | ||||
| Percentage of concentration risk | 14.00% | |||
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Net accounts receivable | Customer concentration risk | Customer three
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| Significant Customers | ||||
| Percentage of concentration risk | 9.90% | |||