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SELECTED QUARTERLY INFORMATION (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Unaudited quarterly data                      
Total revenue $ 6,128 $ 5,794 $ 6,042 $ 5,696 $ 6,827 $ 6,671 $ 7,440 $ 6,733 $ 23,660 $ 27,671 $ 25,411
Gross profit 2,568 2,249 2,230 2,151 2,787 2,894 2,856 2,796 9,198 11,333 10,731
Net income (loss) $ (2,470) $ (341) $ (1,119) $ (409) $ 285 $ (7) $ 152 $ 187 $ (4,339) $ 617 $ 109
Diluted earnings (loss) per share (in dollars per share) $ (0.14) $ (0.02) $ (0.06) $ (0.02) $ 0.02    $ 0.01 $ 0.01 $ (0.25) $ 0.03 $ 0.01