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SUPPLEMENTARY BALANCE SHEET INFORMATION (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance at beginning of year $ 308 [1] $ 435 $ 664
Increase (decrease) during the year 66 (15) (201)
Bad debt written off (47) (112) (28)
Balance at end of year $ 327 [1] $ 308 [1] $ 435
[1] The changes in allowance for doubtful accounts are composed as follows: Years ended December 31, 2012 2011 2010 U.S. dollars in thousands Balance at beginning of year $ 308 $ 435 $ 664 Increase (decrease) during the year 66 (15 ) (201 ) Bad debt written off (47 ) (112 ) (28 ) Balance at end of year $ 327 $ 308 $ 435