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           Summary Of Significant Accounting Policies (Schedule Of Warranty) (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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| Summary Of Significant Accounting Policies [Abstract] | ||
| Beginning Balance | $ 634,000 | $ 616,000 | 
| Amounts charged to expense | 217,000 | 258,000 | 
| Actual warranty costs paid | (261,000) | (240,000) | 
| Ending balance | $ 590,000 | $ 634,000 | 
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- Definition 
          Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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