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MAJOR CUSTOMER AND GEOGRAPHIC INFORMATION (Schedule of Major Customers) (Details) (U.S. Quartz Products, Inc. [Member]) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
U.S. Quartz Products, Inc. [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total revenues |  |  | 15.60%

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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