Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Schedule Of Warranty) (Details)

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Summary Of Significant Accounting Policies (Schedule Of Warranty) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
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