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G. INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Gross Amount $ 6,538 $ 6,001
Accumulated amortization (2,531) (2,008)
Intangible assets, net 4,007 3,993
Patents    
Gross Amount 6,524 5,987
Accumulated amortization (2,519) (1,997)
Intangible assets, net 4,005 3,990
Trademarks    
Gross Amount 14 14
Accumulated amortization (12) (11)
Intangible assets, net $ 2 $ 3