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MARKETABLE SECURITIES (Tables)
6 Months Ended
Jun. 30, 2018
Debt Securities, Available-for-sale [Abstract]  
Schedule of net realized (losses) gains and reclassification of net realized (losses) gains from other comprehensive income
    Three months ended     Six months ended  
    June 30,     June 30,  
(in thousands)   2018     2017     2018     2017  
Net realized (loss) gain   $ (1 )   $ 2     $ (20 )   $ 12  
Reclassification of net realized gains from other comprehensive income   $ (1 )   $ 2     $ (20 )   $ 12  
Schedule of gross unrealized gains (losses) on marketable securities
  June 30, 2018   December 31, 2017
  Gross unrealized   Gross unrealized
(in thousands)   Gains     (Losses)     Gains     (Losses)  
Municipal Obligations   $ 3     $ (40 )   $ -     $ (70 )
Corporate Obligations     2       (10 )     -       -  
    $ 5     $ (50 )   $ -     $ (70 )
Schedule of amortized cost basis, fair value and net unrealized gains on available-for-sale securities
    June 30, 2018     December 31, 2017  
Type of Securities   Amortized 
Cost Basis
    Fair 
Value
    Net
Unrealized
Losses
    Amortized 
Cost Basis
    Fair 
Value
    Net 
Unrealized 
Losses
 
(in thousands)                                    
Municipal Obligations   $ 9,651     $ 9,614     $ (37 )   $ 13,101     $ 13,031     $ (70 )
Corporate Obligations     8,746       8,738       (8 )     -       -       -  
Total   $ 18,397     $ 18,352     $ (45 )   $ 13,101     $ 13,031     $ (70 )