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SUPPLEMENTARY BALANCE SHEET INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Trade:        
Open accounts $ 1,241 $ 1,177    
Less - allowance for doubtful accounts 0 [1] (327) [1] (308) (435)
Trade $ 1,241 $ 850    
[1] The changes in allowance for doubtful accounts are composed as follows: Years ended December 31, 2013 2012 2011 U.S. dollars in thousands Balance at beginning of year $ 327 $ 308 $ 435 Increase (decrease) during the year - 66 (15 ) Bad debt written off (327) (47 ) (112 ) Balance at end of year $ - $ 327 $ 308