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SUPPLEMENTARY BALANCE SHEET INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Trade:        
Open accounts $ 2,595us-gaap_AccountsReceivableGrossCurrent $ 1,241us-gaap_AccountsReceivableGrossCurrent    
Less - allowance for doubtful accounts 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent [1] 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent [1] (327)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (308)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Trade $ 2,595us-gaap_AccountsReceivableNetCurrent $ 1,241us-gaap_AccountsReceivableNetCurrent    
[1] The changes in allowance for doubtful accounts are composed as follows: