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F. INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS

At December 31, 2013 and 2012, intangible assets consisted of the following:

 

    2013  
    Gross Amount     Accumulated amortization     Intangible assets, net  
    (in thousands)  
Patents   $ 1,632     $ (784 )   $ 848  
Trademarks     10       (7 )     3  
Total tangible assets     1,642       (791 )     851  

 

    2012  
    Gross Amount     Accumulated amortization     Intangible assets, net  
    (in thousands)  
Patents   $ 1,509     $ (718 )   $ 791  
Trademarks     10       (6 )     4  
Total tangible assets     1,519       (724 )     795  

 

 

For the years ended December 31, 2013, 2012 and 2011, amortization expense for intangible assets, included in general and administrative expenses on the income statement, was $68,000 $60,000 and $46,000, respectively. The remaining weighted average amortization period for intangible assets is approximately 12 years.

 

At December 31, 2013, approximate amortization expense for intangible assets was as follows (in thousands):

 

2014   $ 68  
2015     68  
2016     68  
2017     68  
2018     68  
Thereafter     511  
    $ 851