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CONCENTRATION OF RISK: (Tables) | 12 Months Ended
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Dec. 31, 2011
CONCENTRATION OF RISK: |
Schedule of concentration risk for cash equivalents invested |
Country |  | % of total cash (1) |  | % invested in one institution |
United States |  | 86.9 | % | 25.2 | %
Peru |  | 9.1 | % | 84.3 | %
Mexico |  | 4.0 | % | 96.1 | %
(1) 97.7% of the Company’s cash is in US dollars.
Schedule of company's largest customers as percentage of accounts receivable and total sales |
|  | 2011 |  | 2010 |  | 2009 |
Accounts receivable trade as of December 31, |  |  |  |  |  |  |
Five largest customers |  | 35.9 | % | 49.1 | % | 37.4 | %
Largest customer |  | 10.8 | % | 16.3 | % | 11.2 | %
Total sales in year |  |  |  |  |  |  |
Five largest customers |  | 28.7 | % | 29.6 | % | 35.1 | %
Largest customer |  | 7.3 | % | 9.9 | % | 8.5 | %

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